When did you last get it aligned?
Drive the car like you normally do for fifteen minutes or more. Stop, get out, push the front end down as much as you can. Does it bounce? If so, replace shocks. Got this from one of the "techs" from Bilstein.
It seems to me, even if your car passes this test, the front shocks may still need to be replaced.
Get an alignment from a reputable Porsche shop. They will tell you if anything else is out of the ordinary (tie-rods, bearings, ball joints etc.)
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Nick Hromyak
'85 Carrera 7 & 9 Fuchs
Havin' Fun in Sacramento