Btw if by change you mentioned in increasing is firing arc, pen, dmg, set up time, sight and reduce its RA in exchange of creeping camo, we both agree.
You want it to have more damage than all other AT guns even though it's cheaper and arrives earlier? And you don't even mention range, which is it's most distinct weakness? Not to mention RA reduction would barely do anything against tank shells
Give it a 5th man, no movement while camo'd, and it can't retreat until you deactivate it. Give it back the range bonus with vet (used to be vet 4, should be at vet 2 or 3) and then let's re-evaluate