Hi Todd
your flying wayyyyyy tail heavy,
move you c/g forward probably an inch and your dive will go away ,,, Trust me
remember tail heavy elevator will be sensitive and c/g forward elevator is positive and effective around nuetral
it will require very little elevator to mantain inverted flight ,,,,however you might require more over all throw in the end
when you get way back on the c/g the airplane behaves opposite of what you think it should, very confusing.
make sure your wing inc is 1/2 pos to the thrustline of your model and your motor should be 1/2 neg to the thrustline
your c/g should be around 25% of the MAC not in the 30`S where most models are set up
try this and report back please
P.S.you will find your snaps, spins, knife, up and downlines all improve with this setup
Bryan