It boggles my mind how you don't have it in you to make the game harder when you are fully capable of doing so. I see people doing runs in games like God of War and the Souls series where they don't upgrade their weapons or anything.
Also you ignored one suggestion and that being that you use armor and swords below your level.
Its not hard.
However, I would not be opposed to another difficulty where they made it such that enemies scaled to your level.
Nerfing ourselves, as you put it.. is an absurd idea. No offense. Why in God's name should we neglect the fun and thoughtfulness (and rewarding feeling) of choosing the correct specs, mutagens, oils, potions, etc. because they've not properly balanced the most difficult difficulty level? I just.. don't even.. no words..
Edit: It's not that I'm ignoring the suggestion to use weaker weapons or armor.. but isn't that sort of a ridiculous notion / idea? Isn't the fun of crafting level 34 Feline gear USING that gear at level 34, and experiencing the power creep? Nerfing myself is the last thing I'd want to do to help them balance their most difficult difficulty.