What Tom said^^^

When jumping from 2 to 3 blades or back its normal to change ONE of the prop factors but not BOTH.

IE: from the 24x12 to the 22x10......you lowered BOTH dimensions. Normally you would only change ONE in order to keep your engine RPM in the same basic range and to maintain your PLF (prop load factor) say a 24x10 or a 22x12 (x3)