I waited until I was able to get the Bixler Chassis installed before I went out on a flight with my APM 2.5+. Once I turned it on, the uBlox got position really fast. It was really windy today. I took off in manual mode, flipped the switch to "Stabilize" and it leveled off like a champ. I alternated between Manual and Stabilize for a while, then I switched to RTL and it performed perfectly! Really glad I got the Chassis, because it made attaining the CG super simple. Thanks to everyone that helped to answer my questions. Looking forward to many more flights.