I have to agree with RR, go with a OS 1.60fx. 18x6 Mejzlic prop, and 15% fuel. I ran this combo all last year, with great results. Take off 30 ft. roll inverted and climb out, vertical to you cann't see it. I'm not into hovering, but did do a few, aways up, and had no problem pulling out. Only aa small bit of throttle to hold it up. Os 1.60 ran super, with SlimLine pitts muffler. Just don;t put tank all the way back to wing tube, center between tube and fire wall, and you don't need a pump. We have a Yak 73 in. with a YS1.40 DZ on 30% nitro, and it couldn't keep up with mine. My 2 cents.
Rick