Regards frame size, had exactly the same issues I’m right in the middle of the frame options. Do I go med and use a 110mm stem and lay back? Or Large with in line post and 90mm stem. I'm 6'1 33 inseam.
My previous frames/bikes I normally go a bit smaller so i can throw them around but loose pedal stroke and using a the longer stem always make me feel a bit awkward.
I ride the KM810 frame (same geometry) and soooo pleased I went with a LG, I'm sat closer to the BB than would normally be and the short stem makes the steering so positive. The large has the deceptive feel of a 18" frame not a 20".
The bike is so trail friendly, which is brilliant as races are getting more and more technical these days. Its has perfect race geometry.
If anyone is down south near Brighton please come and give it a try. or if you see us at any races ask for a ride. We normally have an Lg and Med bike with us.
KMP
Cheers
Fraze72