If a valk is flipping into a roller after only a short while throwing it backhand, there's something wrong. A faster disc will mask that problem and make it worse. You should be able to throw the most understable disc backhand in a hyzer and make it hold that hyzer line all the way to the end when you try. If you can't do that with a valk, sidewinder, or even roadrunner, then develop that skill to achieve clean form. Forehand is similar, but the amount of torque from forehand is a bit more. Still, sidewinders are known to be great forehand discs, and valks are even more stable than those. I suggest you try something more like a leopard and teebird. Use the leopard for backhand and the teebird for backhand in a headwind or forehand. If you groove your throw to that combo, you should be pretty well off. Firebirds are more useful for extreme headwind and overheads.
