I applaud your work as I find the original physics from milestone to be too permissive. I like that the overall grip has been tuned down and lower spec bikes are now also fun to use. However now breaking became too critical especially for higher end bikes on slicks. Sometimes breaking hard, even if straight, induces a pendulum effect that always ends up in a fall.
I think you are going in the right direction with your mod but you might have gone too far. After all, we are left with a controller to pilot the bike...