Do a search on "Props" in this forum originated by Paul Swany. Check out 3Dreaming's modifications to a standard Zinger. This is what I am running. I am running the modified 12x4 Zinger on a Webra 50 with a Mac Header and Long tuned pipe. It doesn't have the pull of a APC 12.25 x 3.75, but its transition more than makes up of it. The modifications according to 3Dreaming increases the Zinger's pull termendously - IMHO
Hope that this helps!
BTW - Where are you flying in Atlanta? I'm not far from you.
Kevin