Hi Bobby, sorry about the delayed response, however, I think you might be swingin' too much pitch for 3D. Try maybe a 15x4 on that .91, and go w/ wood if you can't seem to get a few more rpm's. As stated, I've got an APC 16x4W on that 1.20, and it might seem rather small, but it's a heavy prop. And because it's a little under-sized, my engine revs-up RIGHT NOW! (you may need to x-tend your ldg. gear). But first, try to lighten up that plane. As suggested move all equip. back and as promised I've posted several pics of how I went about doing so w/out compromising deflection