Sean,
I'm a member, but not an officer of the club. I've probably seen you at the field before! I'll look for you this weekend.

I'm not familiar with the oscilating pump (is it a perry?), but it sounds like you are in fact making it rich at midrange by pushing too much with the pump. When you open it up to full throttle, it needs a lot of fuel, and I suspect your line diameter will not keep up with the demand for flow. Are you using standard diameter lines and tank clunk? That is the first place I would look. There is a great website for Saitos I'll find and post as soon as I can find it. It addresses the need for the large tubing etc.

See you at the field,
Jeff Keefer