exactly, they completely shut down cons cause they have a weird dps curse (the bar has the same problem but not as accentuated as there is no close range main line inf for axis that loses to bar)
mp40 would give a choice to cons if they have or don't have upgrade (close in if no mp 40, stay at range with mp 40) same for toher main lines
While you are at it you might as well swap the fire nades for stick nades and put the fire nades into fuersturm.
This immediately fixes the problem where Volks run trough mg (looking at you Vickers) fire and throw a nade and run away. It will make allied MG play more viable.
And of course having a fire nade in Fuersturm doctrine makes thematic sense.
So I say:
STG to Fuersturm
MP40 to Volks
Incendiary grenade to Fuersturm
Stick grenade to Volks