Tool in active-hand: +50 to Repair
Super Tool in active-hand: +100 to Repair
I doubt that this can increase the skill above 300, so most you'll probably need to still raise it to 200% for good effects. Luck doesn't affect Repair, and Jinxed doesn't affect Repair.
Solar already has said science needs a lot of updating because the materials you get from it still reflect pre-wipe stats, and no HQ stuff, so we can only wait. But 84% science will get you almost nothing from disassembling guns/armor.