awh shoot, I'm sorry. yes there has been some massive change recently which can break if you downgrande/upgrade the mod, so sorry, you can use the /turret-xp-dev command to give yourself back some levels if you need to, on a per-turret-basis.
hopefully you won't have to do that again, and the 0.11.2 (not 0.11.1 release) will fix the tps issue, it's in the release process right now