I too am guilty of re-shaping a lot of wooden props I consider the Zinger to be a rough blank and I carve what I want into it. If you look at some of the Zinger tips, you'll actually see a backwards airfoil: that is a sharp LE and a blunt TE. Not good!
On my YS .91s I have always used a 15X6. I think for 3-D a 16X5 would be even better. My .91 on a 15X6 hauls booty around the sky and still gives unlimited vertical on a 9lb Ultimate but I think it lacks the insta-thrust at low speeds. I didn't like the performance of the APC 15X6 because the airfoil is too thick and won't let the motor unload. A while back I built a mold for my own props after carving up a sweet Zinger "blank". I built a bunch of carbon props to play and had a lot of fun tinkering with getting the perfect prop! The power point prop airfoils look to be machined a lot better than the Zingers but I can not attest to their performance. The pros I use to fly around flew Bolly CFs. Heafty price but great performance. There's a lot to be said about airfoil integrity on a machined prop mold.