Use a proper fork all in both legs, F2 with two riders SAE30 just you SAE20.
Decenr fork oils wern't about when the books were written for these but are far better than any other straight or mixed batch that used to be used.
As you have to take all the mudguard, wheel etc off to do one I would do both. There is a "Fix" for pitted stanchions it you need it PM me and i will explain it