Update: did some field work with my Leopard (DX 172g) and a couple other understable disks, an Archangel (DX 166g) and a Roadrunner (GS 149g). I can hyzer flip all of them to some extent but the Roadrunner works the best, maybe because it's so much lighter. Release angle makes a big difference. For the Leo and the Arch if I put too much hyzer angle on it they just stayed hyzer. But flatten out the angle a bit and they popped up very nicely and sometimes flipped over. The Roadrunner I can throw on a sharper hyzer and it still pops up and flips, especially into a headwind. With my old Wraith (DX 143g) I had to throw it on a very sharp hyzer angle to keep it from flipping too soon, and into a headwind: no way.