Yes it is good idea to increase theyr cost but 1st please change somehow ostheer teching so they will be having mp just for something.
We all know how ostheer suffer from teching , and if we increase mg and mortar cost maybe only for 40 mp , people will start spamming lmg grens (even worse with cas resource distribution) and that is not what we want to see.
And im not fan of maxim buff because of poor OKW that is unable to defeat cost effectively buffed maxim spam at level of ostheer hmg42
And we all know russian mortars were only good becuase of precision and now are big shit comparted to ostheer one.
Ostheer sniper is another think but this is not thread for him , there is other thread for him.
In terms of Teching cost fix, just you wait until NDA
Maxims don't necessarily need a buff. Mg42 with a cost increase would make the maxim a more spammable mg, so it will at least have 1 advantage. Also, if the leig ever gets buffed (wink) then the maxim can get its deserved buff.
If players spam grens instead of building an mg or 2, they will be giving up some of the biggest advantages ostheer has early game, and paying a price in that way. Saying that an overperforming unit is fine because it may not be used is false logic, and I doubt players will be willing to give up the new MG42, especially vs. USF.
Edit: Whoops, looks like I derailed this thread.
Soviets have multiple counters to gren lmg blobs, you can use:
Mortars
Artillery (If not CAS)
Katyushas
SU76 barrage
M5 AAHT
T70
ISU-152
Demos
Mines
Pretty much anything that can't take damage from lmg gren blobs while attacking them. Armor works too, but T34/76s aren't the best units to shoot infantry.