So the nose-down I felt on the tailed Nutball during thrust tests(and added trim for) is fake news. I wasn't sure this crazy plane would fly, but it did, although the first flight was wacky and could hardly get it to stop climbing and vertically stalling and torque rolling vertically and stuff. I brought it down light enough, took away the up trim and added a barely noticeable hair of down, and this is the result:
It definitely has just a bit too extreme a dihedral. The banking is sort of ungainly and tumbly at times, but she always rights herself. Turning wider is a little awkward some times because there's some resistance there, probably adverse yaw or something from the extreme dihedrals. Despite these flaws, the plane actually handles very well! It is a bit more like a standard trainer plane than a stock Nutball, just like I intended. An optimized version with a milder dihedral and other small changes will be a big hit, and I plan to work on that soon, but for now, I'll fly this beast as much as I can and learn more.