MajorTom
QuickBlue
Those look like MotorcycleLarry.com peg extenders. You give up some cornering clearance with these installed, which is why I sold the set the PO of my bike had installed, but they do ease the knees.
I'm 5' 11", or at least I was in my youth, and have a 34" inseam. The MCL risers were installed by the PO and I have the seat in the highest position in the front bracket, but the second from highest in the rear, to reduce sliding forward during braking. I sit pretty upright, perhaps partially due to the seat position (?) and don't have any noticeable weight on my wrists.
I have the front in the middle and now the rear can go to it's lowest position.
I keep my seat in the high positions front and back. It's a bit of a stretch on occasion but doable.
The most comfortable position was middle for both front and back. However something from the seat (molding ribs?) caused small divots in the Tup so I went back to high/high. It only seemed to happen with the rear of the rider's seat in the middle position.
If the Tup didn't (doesn't?) suffer I'd try high/mid or high/low. Let us know how that works out for you!