Gawain thanks for explaining to vipper why a simple dps comparison doesn't show the whole picture.
Another way to look at your suggestion might be to make penals come out with 5 men, and then mobilise reserves gives them +2 men, making total of 7 for late game.
IMO no other tweaks would be needed then and it seems an elegant solution. Helps incentivise going for MR when it helps both penals and cons, plus with 5 man penals and ptrs changes they'll still be reasonable deterrent Vs light vehicles in early game.
I like the suggestion of having them come out with 5 men for something like 270 mp. Some of the RA bonus might need to be transferred to vet 0. They start too slow and bleed too much in larger game modes.
They shouldn't get 7 models with MR. MR should lower the reinforce cost and add the sixth man.
Also, they should get some type of sight bonus and camo with the PTRS. That would also help with MP bleed and would turn an otherwise lackluster unit into something more useful. It would also help offset the ISU nerf.