Good evening everyone! I just finished my CS8 Heavy Lift from QC build recently (MK stack). I decided to do a couple test flights in a bare bones configuration (just frame, motors, PDB, ESCs, and Flight Control). The first flight was 20 seconds of sheer terror. Barely got her back on the ground without crashing.. but managed. The craft kept wobbling all over the place. My thought was that without a payload the craft was overpowered and top-heavy, as the battery mounts to the top. So I zip-tied a 10lb bar-bell weight to the bottom center plate. The second flight (with the weight) was much more controlled and lasted about 2 minutes. It was a fight to keep it hovering in one spot though. If I let the pitch/roll stick center itself the craft wanted to pitch forward at a rather alarming rate. As I said, there's nothing but the bare bones on it right now. Everything is centered. I tested the balance by placing a finger under opposite booms - everything looks pretty well balanced. So I'm guessing this pitch issue can be corrected by adjusting the pitch trim on the Tx (MC-32). But I'm concerned that this is just addressing a symptom and not the cause. All axis' trim are set to 0 (centered). Should I be looking for a cause that is unrelated to trim? Thanks everyone!