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I use 33 front, 35 rear.
The 50 PSI on the tire is the MAXIMUM pressure, the manufacturer is indicating that if you go over 50 PSI the tire may explode.
The Boxster manual recommends 29 PSI in front and 36 PSI in the rear - with these pressures and stock suspension you will have fairly large understeer(front end slides in a straight line instead of turning around the curve if pushed too hard).
With 30PSI in front and rear you will have moderate oversteer (back end slides out like an old Camaro when pushed too hard in a curve).
Porsche is delivered with 205 int the front and 255 in the rear(17 inch wheels). If you have 255 in the front you are likely to scrape the front of your tires on body parts during hard bumps or hard cornering. If all 4 tires are 255 you also will have more oversteer - you probably have 205s in the front.
30 PSI is a little too low for good grip in most street tires.
My favorite pressure is 33 front and 35 rear as this seems to have very neutral handling (for S M030 suspension).
What kind of tire did you get?
Can you confirm you have 205s on the front?
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