Wait essentially you want them to become better obers that infiltrate and drop at cp2?
Dafuq is this
Spawning slightly earlier with 2 Gren Kars + 2 FG42's is much worse than just spawning with 4 FG42's at 3 CP as they do now. Furthermore, it takes them a long time to finally get their 4 FG42's (panzer authorization, so 120 fuel after your first/second light vehicle). The change has made their timing worse.
Instead of moving them back to 3 CP, giving them 4 FG42's again and making them more viable there, you could keep them at 2 CP, but give them 2 Ober Kars + 2 FG42's as an inbetween. It would still take them a significant time to get 4 FG42's.
Note: An RA decrease together with an FG42 buff (however minor) is kind of much, so I'd prefer just an RA decrease and evaluating from there, but if the balance team really wants to keep them as pure glass cannons then keep the DPS buffs instead of giving them lower RA.
About your comment: They won't be quite at the level of LMG obers with their worse far range dps, worse RA, worse veterancy, faster damage drop-off and non focus fire FG42's. Probably more comparable to the to-be-buffed G43 Pgrens.