I think you're comparing apples to oranges- apc = plastic/ heavier to xoar = wood/lighter.. If you and your motor like the spool up of wood then stick with it. I would compare wood to wood. Try some [link=http://www.vesspropellers.com/servlet/the-Sport-Series-Props/Categories]Vess[/link] props. I run 6 pitch props on 4 strokes because they torque up more than 2 strokers. If you want a durable prop look at [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXZ981&P=SM]MAS K[/link] or my favorite has been [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXNGU4&P=SM]MAS S2[/link] lately. I run 14x6s on my saito 91. It's your decision though.