The power is NOT the same. The YS 62 WILL eat the OS 56 alive. The YS is not only bigger displacement, but also supercharged. The OS 70 which is of greater displacement will also fall short of the YS, because the supercharging more than makes up for a little lacking in displacement.

I do not find the YS more difficult to tune, the high speed needle tunes just like every other engine`s and the low speed needle is an airbleed and tunes just like every other airbleed, meaning the OPPOSITE way of a "normal" low end needle (turning inn RICHENS and turning out LEANS the mixture)
The regulator seldoms need any adjusting and if it does it tunes like the high speed needle, only it regulates the middle rpm range (turning out richens the mid range and turning in leans the midrange) Easy peasy

Once my YS is tuned and adjusted I just fly and fly and............. only occationally tweakes the high speed needle a few clicks to adjust for weather changes

Ahh, I forgot. 30% fuel is EXTREMELY expensive here in Norway, but if absolute max power is not required I retune my 110 and run 15% (it still outperforms similar sized fourstrokes)

I even ran it on FAI fuel on one session just for the hell of it and it still ran ok, not terrible powerful but for relaxed flying around in the sky it worked fine, never quit or anything.