Some thoughts on some of the lesser used Imperial Only options right now
Admiral Tagge
In a meta where dedicated Flotilla hunters are starting to pop up, over all damage and number of attaks is increasing, I truly wonder if the extra brace or redirects you would get by having Tagge would be more beneficial than Motti. He is 1pt more expensive than Motti and I think that drastically hurts him but I could see him being a champ in a brace heavy jousting type list. Also he works really well with Arq TRCs just burning Evades on turns 2/4.
Admiral Konstantine
Seems good in a 2x ISD bee hive (squadron fleet) or a 3x VSD Bee Hive. With tractor beams you slow the enemy down in the middle of your squadrons and just sting them to death like it was my girl. Not sure how good it is but this is how i would build it. With slicer tools it may be really easy to drop a ship to speed 1 and keep it in arcs and the bee hive to blow it up.
Admiral Ozzel
He seems like a weaker Jerrjerod. His speed increases are interesting on raiders that can go from 4 to 2 (better maneuvering) once they get behind. Possibly best in a fleet with 4-5 raiders and 1-2 arqs. He is a wolfpack, he wants to get in, get out, and cause mayhem I feel. Raiders are just weak and can't take hits so you will spend a lot of time trying to position to get out of danger. He also may be a really good joust admiral. Being able to go from speed 2 to 0 has its merits if you do not want to enter red range on an opponent. Being able to go from 3 to 1 to get them in your front arc longer is also good. I do not think ozzel is bad. He may take the most careful planning (or defense liasons) of all our admirals. Knowing when to drop or increase your speed is required to jockey for position effectively.
I feel these 3 admirals don't see much play as they require ships to be built to fit their command style. Motti, Tarkin, JJ, and Vader just buff your fleet. They don't require any special builds. I feel like Konny, Tagge, and Screed require you to try and play into their bonuses which makes your plays on the table very predictable. Imperial predictability is in a lot of ways true to the source but being predictable is typically a bad thing in table top gaming.
Moving on
Admiral Chiranaue
As @Versch has stated on the IFF podcast lately, old is new. Chiranaue works wonders with Mauler Mithel in a new squadron heavy meta. Go listen to the latest episode for a bit more on this.
Commandant Arseko
Interesting officer. Expensive which is the main issue here. Could be a good way to engineering tokens on an ISD from a gozanti or interdictor but again, super expensive. Maybe in a conga line of arqs or raiders. His price point is just steep for whats in his category.
Director Isard
Knowledge is power. Its only 3pts sure but there are better utility officers as well. This can give you some incite for sure and may pair well with slicer tools but as more and more fleets have 1/2 command value ships her value goes down.
Admiral Titus
Interesting fun little dude that changes speed. Most fleets navigate turn 1 to bank a token so forcing someone to not have one in the coffers may be good. I see more people use him to slow you down where i wonder if speeding the enemy up is a better play. For 2pts he may be worth it for that once in 10 games where he makes a difference. You can certainly play around it with some objectives as well.
On to Titles
Devastator
Expensive but has high pay off later in the game as its drawing fire. With Motti/Blast Doors it may be a solid choice for pure damage output. It is an expensive title on an already expensive ship.
Corrupter
Good if activating Rhymer with Firesprays or just Firesprays as speed is there biggest weakness. Solid with TIE Bombers and Tempest Squadron due to speed 5. A moderately priced upgrade, that can benefit what is shaping up to be a fighter meta.
Warlord
Warlord + H9s = Auto Damage to Squadrons. If squadrons are dominating your meta take Warlord, H9s, and Quad Laser Turrets for Counter 1. Great in the mirror match. Add in Mauler Mithel and Boba Fett and you are talking about a lot of Auto Damage going around.
Dominator
A staple in Core Set and Wave 1 imperial fleets. I feel that while this is our most expensive Title (IIRC) the introduction of Projection experts Interdictor, Spinal Armaments, Tua, and Blast Doors this ship could form a very sharp point to the spearhead. Add SW-7s and you are doing some crazy amounts of damage. Expensive investment? Sure The payoff could be astronomical.
Impetuous
Not really being underutilized too much anymore but Impetuous on a Raider1 with Ordance Experts, Flechettes and Kallus can really harry enemy squadrons. 4 points isn't too expensive for what it does. Worth trying if running single raider and you have some points to spare.
Vector
2 to 4 (expanded hangar bays + token + command) Speed 5 TIE Fighters or TIE Advanced may be good to engage on the sly. Most people expect Interceptors to get there and fast but a few points for a surprise speed increase has its uses.
Insidious
Being dicussed right now in another forum. With Jerrjerod, engine techs, and overall higher number of activation this title could see some play. Yes its expensive. In a meta with MC-30s coming in and trying to get out and flotillas having a ship with a lethal mid range to chase or finish off a ship could be a big benefit. Operative word being could. It needs some more play testing but my gut feeling is that it has a lot of potential with JJ.
Just some thoughts ive been kicking around lately. Feel free to comment and add to anything you'd like. I am interested to hear others thoughts on some of the Empires lesser used upgrades.