250 at the wheels is 295 at the crank with a 15% loss. 993 engines locally are doing 270 at the wheels plus or minus a HP or two. You are pretty much where you should be with a 964 3.6 in a good state of tune.
Easy enough to make 300 at the crank from your dyno @ a 15% loss but it is going to cost you some coin. I suspect your new exhaust is why you are @ 295. If not that is where I would look for HP. Porsche did just that in the 993.
As Jack and Craig mentioned already, no way to make 300 at the rear wheels with bolt ons.
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