Oh my gosh - thank you so much! This is actually IMMENSELY helpful. I'm so sorry if I missed this in the instructions, I try to be thorough but sometimes my mind skims important things subconsciously. This entire time I thought I'd destroyed my game and it was forever missing the EP13 Delta file (I feel so silly). Then it must be some other mod/cc causing the flickering... thank you. I'll be re-installing your mod properly this time and then I'll sort out what else is causing the weird shadows.
I appreciate you so much!! Have a lovely rest of your day and TY AGAIN!