What is a disc similar in flight characteristics to an Xpress but is made by Innova? Sidewinder, Roadrunner?

Yes, the Sidewinder and Roadrunner are your best bets. Maybe even a leopard.

amen. or a well beaten roc

try out a TL

I think the classic disc used for those trick shots that you force a hyzer release but it quickly flips back right throughout the flight is a beat stingray. I've even had a beat DX Valk work well that way but it's a longer distance version of the Xpress used in that manner.

Cheetah

Xpress = Leopard or beat Valkyrie

Sidewinder and Roadrunner are much faster than an Xpress.

The Leopard is a fantastic disc ... I'm really loving the Star Leopard, it'll turn over, but I wouldn't call it "flippy" ... nothing like a DX Leopard.