If you can rewind them (some pups casted in epoxy are tough job for the rewinders out there), do that, you can make them hotter as you said.
But you could always replace them with those guitar size TB pups you can find on ebay and have a raunchier tone.
Sidewinder pickups are clean beasts, even if you wind them hot, you won't get much grit out of them. They have a more "single coil" character.