My Rebel measurements for the Balancer:
Front to Mains 800mm
Mains to CG 83mm
Distance from Mains 1043
The electron's set screw on the main's trailing link is adjusted to fit the wheel wheels. But I did exercise the springs a bit by lifting and compressing the springs a couple times and then lifting and letting the plane settle on its own. The nose gear's spring always sits fully extended.
Personally, my many experiences using the balancer is you don't need to be exact. I normally get as close as possible on the measurements for the Xicoy and then confirm a reasonable balance on the Easy Balancer. Ultimately, even then, I typically end up doing some sort of fine CG adjustments after the maiden. Everybody's idea of "good handling" is frequently different.
I have the UAT on the top deck. The Fuel Tank is forward of the CG. So, you may want to put the pump behind the fuel tank, etc.
2 Spektrum 2000 Mah LiPo Rxer Packs & 1 Kingtech 3800 Life
Fuel Pump Location
UAT, Powerbox & LG Control Location