So assuming we're not using 88B, is there 24 points of scum that can make up for the loss of the Aggressor's upgrades save Autothrusters?

Yep. Two Binayre Pirates.

Or am I reading this wrong?

Two Binayre Pirates or a single TLT Y-Wing are the most efficient and effective options I can think of. You could maybe go for a Kihraxz or Scyk, but neither of those is as tournament-proven, nor do they fit into the 24-point allotment so neatly.

Yep. Two Binayre Pirates.

Or am I reading this wrong?

lol at first I thought the OP was talking about three Aggressors not a 3 ship list with two of them aggressors. I think we all know that the most you can have in a standard 100 point match is two.

That being said Yeah I believe the OP is looking for a good list that uses two Aggressors with the title + 1 or 2 more ships. I don't think it has to be a 3 ship list, it just has to have at least three ships and include two IG-88s.

Well if you are not burning points on upgrades then yeah B would be out of the question so C-D is probably going to be your likely choice. Still not sold on A unless 7-8 ship swarms return but for now the most I see is 4 or 5 ships. As for fillers well you are indeed tight on the point limit with only 28 points left. You're 1 point shy from a YV-666 to go all big list (if only you could take an Outer Rim Smuggler in your Scum & Villainy squadron )

For scum the best fillers would be 2 ScumZies (Z-95s) but with TLT being the big thing you might want to look into a Scum-wing (Y-wing) or a Scumhawk (HWK-290). Don't bother with the Scyks and I am not sold on the Kihraxz Fighters working as a solo generic filler.

Better than you think....

Palob Godalhi + TLT
IG-88C + Enhanced Scopes + IG2000
IG-88D + Enhanced Scopes + IG2000

But which 2 droids do you take then?

You know, IG-88A may not be so bad with the new scoring rules since he could be the difference between partial points on your Aggressors or no points for your opponent.