Reduce the hydraulic pressure to the fronts until you can no longer lock them up under any condition but just barely.
Then increase the rear pressure until you can lock up the rears, then back off just a little.
That should balance the system.
In my experiences it usually is the rear that locks up and needs to have the hydraulic pressure reduced, but I'm always learning.
The level that you should be doing this at should not be possible to do this hard enough on the street.
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