Thanks for your input. I balanced the model upside down on a GP balancer. I left it slightly nose heavy at the most forward reccomended CG. I have another that I built and is ready to be flown with my CG calculations.

The plane flew tail heavy but I was able to get it to take off OK. I could not however, get it in under control and without damage.

I would only offer to file a class action on behalf of other .50 zero owners with similar complaints. The larger CMP warbirds fly better. While there are likely similar issues with the larger planes, I would not want to worry about the certification of the class of plaintiffs.