I don't play thf at a high level so feel free to set me on fire for this one...
Would having to knock the mob down to 1/4 HP before you can steal preven the steal/hide thing? This way there is no real quick rinse and repeat Gil spinner. Or at least have it so you steal a pants item if the HP is higher and then a shiny thing once you (or the party) have nearly KO'd the mob.