This is more of an immersion suggestion than anything else.
I would suggest that axis HMG are swamped. In other words LMG34 and HMG34 move to ostheer and LMG42/HMG42 move to OKW. Properties remain the same but since OKW represent the German army of later area I find it weird to be using earlier version of weapons.
I would go even be tempted to swap the Leig with the grW34. That would be a also a balance issue but one could nerf the mortar to about USF level and buf the Leig to pak howitzer levels and fix a number of issues.
