Where did you get the reas sets from? I have size 11 feet and really struggling changing gear with the standard ones on mine.
I have size 11 feet and 6'3"ish myself - I couldn't wear sidi full race boots with the stock pegs as my legs wouldn't then fit properly under the tank. Tried rotatable 25mm lowering pegs but the gear levers were then too high.
They're Gia Moto rearsets - UK company and really good company to deal with, they are gorgeous with individually replaceable parts (down to a screw or a peg or peg carrier etc). They're pricey but worth it imo (they have some some cheaper factory seconds though).
They do 15mm lower peg carriers which I asked to get in place of the standard ones for the reasets in case they wouldn't be low enough, though I think standard peg carrier would be fine on the lowest holes for me.
I had a titanium gear shift rod on gia moto rearsets that failed on my Street triple 3+ years after buying, so I called to order another, and their response was "that shouldn't have happened, what's your address?" and just sent another to me! Really impressed with their customer service, and the design is just lovely on the rearsets with ball-end mill bit scalloped machining to the surface in parts and really good quality bearings, flawless anodizing etc.