are you running a governor on that X3? At the 3:15 mark it seemed to bog really bad.
On the 500, I couldn't see anything other than some very wide hunting on the tail, but you could have been doing that with the sticks.
As for the plane, need more hot shmoo!!!! lmao. And next time, take the air brakes off the wings. It will fly a lot better. It also looked like it was a touch too nose heavy. Either way, looks like you had a blast and congrats on your first plane. You may be buying this plane that I"m about to receive. I think it's going to be awesome.