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Raising the front ( say by adjusting a coil spring perch ) won't change the spring rate, you have to physically replace the spring to do that. Does this car have coil-overs? If so, experimenting with ride height would be much easier, though the alignment will have to be adjusted after each change. If anything, you'd want the front lower, relative to the rear, not higher.
As far as lowering changing the balance, I'm not a Boxster expert, but in general:
The C.G. will drop, and the roll center will drop by a similar amount, so the front roll couple, and therefore the handling balance, remains essentially unchanged.
Lowering will also lessen front weight transfer by a small amount, increasing the available traction of the front tires, but the magnitude would be small.
The only way to quantify the results would be to try and see.
Steve
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