I’m selling my 2018 rev with charger 2.1 with 2021 and 2020 debonair shafts. I probably should have got the rc2 rather than rct3, as I keep comparing with my old pike which isn’t helpful. But even so I’ve struggled with the same balance (I’m 90kg+ too), and when I have found a setting that’s acceptable, it doesn’t seem to stick and I’m back fiddling with tokens etc again in a ride or two. No air is being lost and it’s serviced on the button. It just feels sensitive to small changes in my weight (riding with or without pack) or temps or something else and isn’t consistent.
The best I got was 30% sag (as accurate as I can, being really careful) and 4 tokens in a 120mm fork. I agree the LSC does not have much of an affect. The 2021 shaft doesn’t help or particularly hinder much IME.
I’ve ordered a Z2 for simplicity and I can put any inconsistency down to it being a cheap fork then :D