Dark Elf Slaves

Has anyone managed to figure out how to use the Dark Elf slaves? They went from my favorite race to never played. I'm either always at the slave cap and simply lose the slaves I get from quests, battles, or rewards, or I'm entirely empty.

Even late game you can't make enough slaves to ever balance out the losses to economy. The buildings that produce slaves can never keep up, and battles don't give enough to keep up.

I sincerely hope they either remove the slave cap or just revert it back to the old system.

Has anyone figured out how best to use it?