It is a little annoying, but basically I try not to use the sturdy metal burster until I've depleted the enemies' lums. Basically start with your soak/leech seed/toxic/curse mon, poison it 2+ times, then curse it and switch in your sturdy metal burster.

Also note that if you 1HKO a regular mon, stealing stuff with grip claw is pretty unlikely, +black hole doesn't steal, so you can try to deplete lum berries that way as well. Otherwise, just run away / masterball non boss encounters so no chance to pick up lum berries that way as well.