Hey!
I've updated the Split Level Lighting Fix mod:
. Basements are now unaffected, fixes some weird looking lighting
. Fixed split level lighting not working on skipped levels and tombs.
. Disabled lighting spilling over to foundations for now, which should fix some weird lighting.
. Doesn't save split level lights in your savegame now, to reduce bloat.
. Fixed outdoor lighting always spilling over to every level regardless of obstructions.
. Greatly improved reliability of RPCLib ASI loading.
Head to the original post and re-download to get the update.