If I were you I'd completely not worry about it at all anymore and just do whatever felt right at the moment. Since you've lost so much range, I would charge to 100% when practical (those last few % are slow...) just so you don't get range anxiety, and then maybe check in on the battery every 3 months or so. It will either stay under 30% deg or it'll go over, but no point in sweating it really, unless you enjoy it.That raises another question. If someone truly believes they are headed for 30% degradation before the warranty expires, why wouldn't someone (super)charge to 100% all the time. I've never seen anything in the warranty that voids the warranty based on charging habbits. Just curious if anyone knows how Tesla handles something like that if someone "abuses" their battery leading to premature degredation? I suppose Tesla is banking on even those habits not causing serious degradation.
A bigger problem I see is when you try to sell the car, someone savvy would check the range and be like, what is this?, sure Tesla says it's fine, but I for example would not buy such a car, because why would I? And that will be real $$$ out of your pocket. Unless you plan on keeping the car forever (or 8 years), you probably want to trade it in to a dealer when it's time for new wheels and let them deal with it.