[Snake2998]

Others on here might well have a direct answer for you but if you get no help then google for Mike Polan's Brake Calculator that will help in your decision making process. Otherwise a riskier process is to measure the pressures as they are at the moment then you at least have a starting point to start moving the bias towards the front.
I would move the bias 10% - 20% more to the front - find a safe place with lots of room for a spin - take her up to 30mph and stomp on the brakes - if she spins move the bias another 10 - 20% to the front - keep this up until she stops straight and true. Then the fine tuning starts moving the bias back until she starts getting unstable then moving it forward again until it feels safe.

Be warned - this whole process is risky - be ultra careful and make sure there is nothing or no one near you that can be injured or damaged or can injure or damage you or your car if things go wrong.