maybe unrelated - but the 810 48t ring and 600 46t ring are / do mount slightly different (I believe *** see below)

I purchased a 46t ring to install on my 810 crank and compared the rings - can’t recall the exact difference (senior moment) but it was enough to convince me to stop the swap from 48t to 46t

the one thing I do recall was related to look / appearance - the 810 ring appeared to be a better quality ring … maybe better material … ? … machined instead of stamped ? …

I also struggled with the GRX FD setup initially … the GRX FD Shimano doc appears to be thorough - but at the time grew impatient with the doc and then just winged it … eventually got it to shift fairly well … it’s a bit clunky but shifts up and down reliably and the trim positions work etc

other thing I struggled with initially was the cable routing - which is unique … sorta / kinda …

*** I believe the 46t ring I purchased is for a 10 speed crank