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The first question is: What tires are you running F/R? Tire size affects brake bias as much as anything. Drivers running square figure out quickly that they can put their car on it's nose without too much effort. Once you have determined your tire size and compound, then choose brake compounds that make the most of your contact patch in braking zones. Running yellow (F) and Black (R) is one good way to move bias aft on a square setup. Another is to run rear pads on the front to even things out some. Always answer the tire question first.

Changing rear brake calipers and rotors or changing brake bias in the hydraulics is probably a last resort. I have not yet seen a 986 Boxster where this was necessary.