Greetings. We had some trouble with T-72s shrugging of a lot of missiles without a scratch in escape missions and I investigated conflicts with other addons. The issue persists with only CUP loaded and the damage done to a vehicle seems very random at times.
The Javelin seems to have more problems on shorter range, a lot more reliable >200m than under. Sometimes a hit does <0.05 damage. I didn't check for hitpointdamage, but after a Javelin and 3 SMAW hits I would expect more than a yellow and still usable barrel ;)
Only really tested T-72 and Javelin and SMAW, I think we had MAAWS and AT-4 too in missions.
Maybe my aim just sucks and I only hit the well-armored non-critical spots, but the Javelin is problematic because you can't aim it yourself.