Oups my bad, I tried to overlap those 2 but apparently failed.
The point is that STG DPS start with lower value and drop faster than thompson (starting from 5 range which is strange but ok). Same system was applied to PPSH/MP 40 but has lower DPS from the get go to compensate.IMO the problem lies here.
And yes the kit gives 2 thompsons, but with the approximation that Sten=MP40, my idea remain the same.
But I don't know which "thompson" is given to AS.
Main difference between Ranges/PAras Thompson and MP40 is the high DPS of Thompson at MID range which closer to that of an assault rifle.
Although some SMGs like shocks PPsh have also seen the MID DPS increase.