You mention that you should use a slower levelling mod. Which one do you personally use since BS seems to have broken several of the slower levelling mods?
I did use the XFO one, but that seems to have the same issues as with others, probably to do with iXPBumpBase. So I have tried using the LessXP mod which seems to be ok, but it would be nice to hear which one you use, thats if you ever get chance to play the game longer than a few hours for testing!
Also I assume you are meant to put the DLC CP .esps after all other MMM .esps? i.e. generally the last .esps bar FOIP CPs.
Just to clarify, there is nothing wrong with iXPBumpBase and broken steel. The only problem is when people deactivate the slower leveling mod while playing a character that previously used it. When Broken Steel came out, many people did this, causing them to level up multiple times since the experience requirement was now much lower.
I can't say every slower leveling mod will work, but ones that change iXPBumpBase will work fine. I know from experience.