Anecdotally, many of us have found the sweet spot for the Roadster under normal conditions to be around 24A.
I finally got around to installing the Gen-2 HPWC's that I accumulated over the years (one as a referral bonus, one from a Canadian), so I can now charge at 70amps. Previously, my Roadster UMC would crap out over 30 amps, so I had it limited to that instead of the 40 of which it's capable.
So, tell me why I shouldn't just set it to charge as fast as it wants now? Sorry if I've missed some pinned post.