I never had a stage 1. I gave them what they agreed to and they earned their stay.
Perhaps you are employing the wrong women.
If you have to threaten them to make them stay, they won't be happy campers.
Perhaps I'm not reading the OP properly and the OP is talking about non employees, in which case the OP is IMO living in Lala land thinking a Thai lass will fill his needs voluntarily, in which case it's no wonder he's having problems.