Why not give Volks different upgradeable antitank weapon? Some antitank rifle more in line with allied handheld antitank weapons. Schrecks upgrade for them is really a no-brainer and I don't personally think blobbing up cheap infantry against decent medium tanks should be a viable tactic. Ofcourse there should be adjustments for puppchen to compensate. Schrecks on panzergrens are fine IMO.
I'm leaning towards reducing panzerschreck accuracy at range.
Pak40: Dmg 160 Pene: 210/200/190/Reload: 3.5-4.1 Range:60
Zis-3: Dmg 160 Pene: 200/190/180/Reload: 4.425 Range: 60
Raketen: Dmg 160 Pene: 200/190/180/Reload: 3.0-3.6 Range: 50
As you can see the only difference between the Zis-3 and Raketenwerfer is Zis has 10 more range and 2 extra men but Raketen fires faster. I also think raketen doesn't get auto green cover but they can garrison buildings and retreat.
How would you like to alter the raketen?