I hate to throw this out there, because there are certain things a man of a certain age should know how to do without instructions: lace his shoes, tie his tie, adjust his car seat. But the manual gives specific steps to get a "good fit" driving position. It has helped me quite a bit with the comfort issue.
I have always liked to have my seat adjusted pretty far back...I don't like my face to be in the steering wheel. When I follow the steps in the manual (and they are pretty detailed), I find it has me sitting closer than I am used to, but it feels right for the car.
It is not an unpleasant change, and I've been driving this new way for a couple of days now. It has definitely taken pressure off of the back of my leg, although I'm still tweaking things a bit.
I dunno. It's something to try. I left my original position set as Memory #1 in case I wish to revert, and this one is in Memory #2.
It's a weird problem to discover at this point. I never noticed it during the test drives. But the lengthy test drives were in the 2018 fabric seats.