Not sure what to tell you on the form, but it's looking much improved. Maybe the femurs are too neutral/not loaded in as much as they should be. There's got to be something major going on though, but it's looking in much better balance.
As far as disc flights though, you're getting more leverage and spin on the disc. That makes discs fly much more neutral, so flippy discs are way more resistant to turn and all discs wait to fade much later. It's weird, a disc that can fly -1/1 for someone at 300' can still fly a wider -1/1 at 375' with improved form, they won't necessarily go -3/0 and turn to rollers with more power...adding that leverage/spin helps keep discs flying. Of course some crappier molds just can't take a certain velocity range no matter what. But this added leverage is how pro's can throw mids 400' dead straight while ams will cut roll them at 280' with torque.