First of all are you ABSOLUTELY sure that the 2 master cylinders are the same bore? If your new one has a SMALLER bore it could easily cause your brakes to be very touchy. Don't assume that they are. Measure them. You don't have to remove the new one completely. Leave the lines attached and just pull it back from the booster and measure it. Also is there play between the booster push rod and the bottom of the hole in the back of the master?
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