Brake help aftermarket proportioning valve.

So after sliding the tail around 1 too ny times when braking, I decided that I'd try taking out the factory proportioning valve on my csx-t and buying an aftermarket one and putting it in the line going to the rears and just letting the pressure from the master run the fronts. Sounded super at the time, but perhaps the 57% reduction to the rears is not enough. Can someone tell me what the stock proportioning valve cuts the rear pressure by? Also, I heard that the B150 van MC has a 60/40 split? Can someone verify this? Perhaps reducing the 40 from that would help. Also, anyone ever run 2 proportioning valves in line. If it works, surely it would cut the rear bias enough to lock the fronts up first. Any ideas here? Thanks in advance.