You could try slaves stick around and buyable slaves.
They are made by the same person, so they work well together
http://www.fallout3nexus.com/downloads/file.php?id=1944
http://www.fallout3nexus.com/downloads/file.php?id=1306
Because i am also playing mostly as a slaver in this game. A little comment to Slaves stick around and Buyable slaves. There are some bugs:
You cant keep your slaves if they are respawners (common raider, talon, enclave patrol, ...). They go on a killing rampage if you leave them 3 days alone because they loose their slave token and get back to their normal behaviour. Nice action to see in the Paradise Falls Slave Den.
101 The collector: Adresses this problem but that is not a full solution. Because the slaves dont get at their original places if they are killed and some other problems.
It was hard for me to play as a longterm slaver with this three mods because of the bugs. I started to debugging them but ended up with a complete rewrite of the slaving system. So it came that i started my own mod. Yes i took a look at the latest updates the bugs are still there and known. I dont think they are adressible without a major rewrite.
And last but not least my mod and these ones are not compatible.
And no this is not an advertisment! My mod is mainly meant as a huge quest mod! With a new slaving system as award at the end of the evil path. The chance that the player gets enslaved while playing mine is very high! It is not an enhancment to the excisting system, like these ones.