Turning off the governor in the 22 and using manual throttle control inputs in no way prepares you for a 300 or 47.
I have found that the correlation between the collective and the engine on the R22 is such that you have to wind the throttle off when raising the collective to prevent an overspeed. Try doing that in a 47!!
Coversion to a 206 is easier if you have flown a 47. You are used the physical size, hydraulic controls and auto characteristics. 22 drivers tend to overcontrol the cyclic much more initially.
Suprisingly though I found the 22 an easier platform for aerial photo work - nice tail rotor authority.