Thank you for the video, it makes me want to get another one flying! Your plane fly's very solid like it's on rails and penetrates the wind really well. Also, very stable when it slows down for landing. Did you try the flaps? Mix a little down elevator (about 7-8% to start) when you deploy the flaps (start with about 30% on the flaps) and then have fun playing with it. These amounts are from memory but should be close.
I remember moving the cg back to 4 9/16 at one time (the rear of the cg is 4 5/8), is was borderline to much but great inverted flat spins, KE and landed like a leaf. Does most aerobatics very well (not 3D) and a great plane to fly and advance one's flying skills. I flew mine for about 4-5 yrs and is a great flyer! Hope you have the same experience.