I think I've figured out the source of 90% of my wrong keypresses.

[Brill_]

I play MNK at 2300+ Skill Speed to get over this issue.

...I may have a problem, tbh, though.

And yes, SAM gets more out of SkS than Monk does, and has some very tidy rotational breakpoints at the 2.2s base CD (under 2s with Shifu), again around 2300 SkS. Sadly, though, it doesn't do Monk damage, in my experience, unless you reliably get Midare and Higanbana, both, into each Trick Attack.

Oddly enough, NIN is fine to me at a 2.46 base GCD, though, if only because of the occasional triple-weaves. /shrug

I'm going to try that with the mnk relic gear... for science. I'm sitting just over 2000 sks at the moment. Gives me a gcd of 1.91 with 3GL and no other buffs.