2.2-2.5? Redline only.
J/K
I do notice from 3ish it's a bit funky. under 3 or over 4 seems to work well for me. I used to go to 5.5 and it was hellasmooth for mebut it's not something you want to do on a colder engine.
here's the weird part... My shifts n-1, 1-2 are smooth but now my 2-3 are jerky. 3-4 , 4-5, 5-6 are smooth too. amateur hour