Basically just either:
1) Throw something slightly less under-stable.
2) Throw with a touch more hyzer so that it comes down tilted slightly more left, and takes a little longer to stand up completely.
3) Throw your shot a little lower (don't aim as high), which will cause it to come down on the ground oriented more left than right.
2-3 are the best way since you'll rarely have discs that are in the perfect sweet spot, and you'll always have to make adjustments.
Not all discs are good roller discs for every player, under-stability is not the only criteria for one that behaves well on the ground for you. Rollers favor the spin-dominant thrower. I used to play with a guy who had so much spin that the disc would actually speed up when it hit the ground, and his discs would literally climb up trees instead of bouncing off.
Drivers: Starlite Wraith (158g), Gummy Champion Leopard (150g), 1st Run Z-Talon (150g)
Mid-Range: Star Classic Roc (146g), R-Pro Roc (157g)
Putt/Approach: Legacy Protege Clozer (158g), Glow DX Aviar (150g)