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I ran a BSX Spec Box for 5 years. My 2c

Many of the SpecBox drivers are running 255 square tires. If that is you, the yellow/black combination works pretty well. This shifts brake bias aft and prevents standing the car on it's nose under heavy braking. I ran this way one year.

If you run 235/255 staggered, running the same pad F/R results in good F/R bias due to the smaller contact patch up front. I ran this way for 3 years, mostly with Raybestos ST-43 pads. I found them to offer better heat management and modulation than Pagids and also lasted longer.

In 5 years of testing and data analysis, my car nearly always turned faster laps staggered than running square. Higher speeds on long straights paid out and 3/4 BSX track records were set running staggered. It runs against current BoxSpec fashion but those were my results consistently.

Good luck and enjoy the car. I think the 2.5L Boxster is an excellent track ride with a very active class. I may have to jump back in some day.