With CK2+ I use:
- Bigger Interface
- Cultural Bonuses
- Interface: Century Gothic
- Interface: Stellaris Colors
- Patrum Scuta CK2+
- The Great Trade League
- Theatrum Orbis Terrarum
- Tooltip: Century Gothic Bold 18
- Velvet Tooltip
Most of these are graphical and font-related mods with a few others thrown in, like the The Great Trade League and Cultural Bonuses. As you can tell, I don't use many and I haven't noticed any problems with any of them. So far I've not seen a need for anything else.
I will have to look at that mod list. I have Patrum Scuta CK2+ and Culture Bonuses (CK2+ version) and both work very well alongside CK2+. For Culture Bonuses, use the CK2+ version, not the vanilla version, otherwise it will not read all cultures and leave them bonus-less.