Have just enough STR and DEX to wear your equipment. Everything else goes into LUK. LUK gives you the biggest damage boost as a thief regardless of whether you're using a claw and throwing stars, daggers, or cutters.
Although, if you're going to be a STR bandit, I don't see why you rolled a 5/5 at all, since the only stat you won't be needing will be INT, which means only one stat would be at 4 or 5.