Uhm.. that is a different guy shooting those guns every time. I can shoot 7.62x39 assault rifle with better control that that KP-31 or greasegun is being shot at, the assault rifle must have less RECOILZ! Or at least so it looks like I had more control.
Also IMO that MP40 has really small recoil compared to most of those guns (beretta or greasegun) it's just being viewed from different perspective making it look like it has more recoil.
I smell bias.