Though I did think of p-factor as a possibility, I forgot about the angle of attack being a player in the extent of the p-factor (I installed longer landing gear because the plane has a tendency to nose over to quickly and dig the prop into the ground; that certainly increased the angle of attack some). Still, I think that the effect is the result of the spiraling prop wash.

I was also thinking it might also be the engine putting torque on the airframe, placing more force on the left wheel than the right. That would be like a brake of sorts, also causing the plane to turn left.

More rudder throw isn't really possible. I had the sucker pegged and it still happened.

I think my first move is going to be putting a 10X5 prop on and going from there.

Thanks for all of you suggestions guys!