Saito220, 180 or OS200 should all give excellent performance for that size and weight but must be used with the correct prop size.

They dont like to be loaded down to 7500rpm at peak like a 50cc gasser. At +8500rpm and they should pull these planes like rockets.

These are the props I would use for good performance with that size fourstroke glow engines 17x8, 18x6, 18x8 or 19x8 for the 220.