2 PGs will always win against shocks.
1 PG will always loose.
Nothing wrong with it, PGs are not counter to shocks, LMG grens are as LMG got penetration.
PGs are not intended shock counter, they don't even have same role of close quarters squad.
PGs for shocks are exactly what T34 is for P4, this is no reason to buff PGs just as it is no reason to buff T34.
It's not good comparison, because t-34 will
usually loose to p4, and Pg will
always loose to shocks(as you wrote)
But yeah, they have different roles on the battlefield...
Anyway, reducing reiforcement cost would be good idea.