RE: Flight Trimming Issue:
There is no problem with right thrust. We run right thrust in most all the Vortex's built.
For your Viper. First, I'd double check the engine incidence to the wing. Make sure you don't have a ton of down thrust, and be sure there is no left thrust while you have it blocked up on the bench….favor having some right thrust. If you find something way out with the engine, fix that and go fly it again. But I'd bet your stab incidence is still off some. That has a bolt on stab right? If so, Id' shim that back of that stab up (1/64" at a time), and fly it.. Repeat the shimming process until the "up" elevator trim is gone.
Once you do those two things…report back to us and lets us know how it goes.