3 things:
1 - Awesome Video
2 - Do yourself a favour, head over to Tradeex, and buy yourself for $20 an authentic reproduction rubber Russian recoil reducing butt pad. My M44 pounds me less than my 91/30 sniper (which doesn't yet have an authenticreproductionrubberrussianrecoilreducingbuttpad..)
3 - how did your groups change with the bayonet extended Vs folded? I just bought my (1946 Izzy) M44 last week and have shot it once, with reloads. Other than needing the sight drifted a bit for windage I notice that at ~70 metres it was shooting about 5 inches below point of aim with the bayonet folded, and dead on with it extended (...and to the right, since I didn't have a hammer and punch with me to drift the sight...). Groups also seemed to be tighter with it extended, but I only shot a pair of 10-shot groups.
(ok 4 - tell your buddy to start lifting ;-) )