I ran a 13x6 MAS on my Pizazz with the Saito .72. It was fast, but hovered like garbage. I bummed a Zinger 13X5 of a buddy and it made a 100% difference. If your using the glow plug that came with your engine, I'm sorry for you. Throw it away and put in an OS "F" plug. The best fuel I've found for my Saito, which gives it adequate power, smooth transition and good idle is Powermaster 15%x15%. I've tried Sig 30% and was not impressed for the money I spent. I'm going to try the APC like others in this forum have suggested and see what that's all about. I'm running one on a ST 51 on a US 40 and like it. Also, have your CG totally dialed in (far back as you can comfortably fly it) as well as lateral balance (wingtip to wingtip). If your off laterally you'll feel it in the amount of rudder you have to hold. The Pizazz is kind of a wierd plane. Once you get it all tweaked out-balance, prop, fuel and radio settings-it will be a sweet flyer and pull off any 3D trick you can throw at it. Make sure to mix-out all the bad tendencies. A computer radio really makes this plane a lot more fun and manageable. Keep the plane light too. Get rid of the stock gear if you still have it on and get the carbon fiber gear for a Sig Something extra from TNT Landing Gear. Use pull-pull and the rudder and use a carbon fiber shaft for the elevator. I've built two Pizazz's now and feel pretty comfortable giving advice about them. I did everything wrong on the first one and everything right, for the most part, on the second. Needless to say #2 is a great flying/hovering plane. Check out www.minnesotarc.com for some great Pizazz footage. It's in the movies section in Pizazz highights.