....just a thought here now, just a thought.
Would it help to put a residual valve on the line going to the rear breaks so that the brakes would come on a little "quicker" before the front gets all loaded up and nose dives letting the rear wheel slide??
I know, one would think the residual valve would make it worst but think about it.... if the rear started coming on a little quicker before most of the weight is being stopped by the front wouldn't it help?????
...there I go, thinking again!!