I too find the shock guards in late game slightly OP. I was in a situation the other day where i had 2 kch and a vet2 pz4 and was pounding three squads of shockers, and the all three shockers were still intact as they mowed down the kch and began to rip the pz4 apart. This is not the only instance of the shockers being a little OPthat I have found. Take four squads of shockers and pit them against four kch's and see the outcome.