Your best bet will be changing your brand of prop. Most guys here feel the Pro Zingers aren't good for anything but stirring paint. Get a Biela, Mejzlik, Menz S, MSC, NX, PK Plus, etc. and you will notice a big difference in the thrust department. I have a Brison 3.2 on a Laser 200 and use a Biela 22x8 with good results. It sounds like you have a strong 3.2 that deserves a better prop . Good luck!
DITTO!!!! no wait--DOUBLE DITTO!!!!!! Zinger pro is what I classify as a sport prop. Not bad-- but best used on Stock Quatra, Zenoah, Fuji, for sport/warbird applications. If you have a performance plane and engine then it only makes sense to get a prop to match.