If you're worried about Soontir, any number of the 33point, Plasma Torpedo U-Boats can also swap out their extra munitions for Flechette Torpedos. It's the same number of ordinance, although the second ordinance shot is 1 red die less, but it really hampers those pesky PTL users. You get all the benefit of Plasma Torp alpha strikes with the control of large ship Flechette arcs. Hubba, hubba.
If one ship gets Soontir in arc (even without being blocked) as I mentioned above, there's 3/4 chance that he's going to need 4 evades to keep from taking damage. This list probably won't have trouble hemming him in, though, and blowing him to bits once the block does happen.
Or 3 symbols and an evade token? Or two symbols, an evade token and a Palpatine? Or one symbol, Palpatine, his evade token, and autothrusters because you fired your missiles at R3? Soontir can dodge a lot of absurd junk, is all I'm saying. Making him avoid one of your big arcs like the plague at the cost of 1 red die per game seems legit to me. With the remaining point, you can also drop 4-L0M on one of these bad boys, so now you've got two ships with a higher chance of acing him, since the guy with 4-L0M can restrict the focus or evade token.
Again, all this really costs you is one red die per game. I just like having multiple arcs that terrify Soontir, but that's me. I mean, blocking is great, but why have a plan when you can have a plan, with a great backup plan, with another pretty good backup plan? Get the job done.