I like you tried to copy the drz rake but ended up setting it less than the drz because it the bike just handled better.
I'm not sure what I ended up with, I'll measure if later and get back to you.
With my dr the biggest factor for improving the handling was increasing the swing arm angle and getting rid of some squat, The dr has very flat swing arm compared to other dirt bikes.
Have you seen the article tony did about rake v trail
He experimented with the rake in a bike by reducing it in stages all the way back to 0 degrees the whole time he kept the trail the same.
The result was quite interesting. He found stability was not changed as long as trail was kept the similar.
There where other effects like less front end dive and the steering was not effected by terrain so much.