Are you trying to balance for 1v1's or everything? If you want to balance for all modes, then instead of changing Gren's RA, you should add a 5th man upgrade that is the same as the one for Tommies. I'd recommend putting the upgrade in T3 or T4 so that it doesn't mess with 1v1 balance but enables Grens to be somewhat survivable in 3's or 4's.
Mutually exclusive with either G43/LMG42 and it could work. IB4 other units:
-All non MG weapons should see the focus fire thingy removed. In fact, we could improve it (not sure how) on MGs.
-BAR DPS mid-long DPS should be nerfed. Double bar could still be a thing but it would be way more CQC oriented that now.
-Double bren removed or exclusive against 5 man squad.
TBH i'll rather have Pios been a 5 man unit late game and HIGH DPS units nerf across the board. 5 man Pios means more repairs + recrewing support weapons.
About OP: messing with damage is just a mess. I don't see a real direction, just a group of ideas thrown around and mix in an explosive cocktail ready to explode. Some changes reminds me of old Relic yolochanges.