Yeah, that's fair. I don't know that I'd tone down double LMGs any more though. They're already the worst upgrade in the game. Maybe nerf IS vet a bit instead? If you tone them down more, I don't think they'll be worth it.
Perhaps an idea indeed, but I don't know if further veterancy nerfs are the way to go. I rather think the problem with tommies being too good when they get a snare is their double lmg 5 men bolstered performance. They become absolutely too durable in that stage. Unfortunately, without adjusting the other things mentioned, they almost have to be.