My Champion Sidewinder, DX Leopard and DX Cheetah started flipping for me before I even realized what was happening. I thought I was making really awful throws. Then I realized that the discs were flipping (doing what they're supposed to do).
Now that I've actually learned to throw a Hyzer Flip, my 150 Champ Valkyrie is my disc of choice for the shot. And I'm actually starting to flip my Wraiths a little now.
I think that it's kind of a progression. For me, anyway, as my form gets better, I've been able to flip more stable discs. And I lighter weight discs also have a tendency to flip easier for me.