1996 855 Platinum Edition with 233K

I have an ongoing hot start problem that is driving me crazy. Car starts up cold no problem every time. It runs beautifully and efficiently without any stalling or hesitation. Just gives me problems when starting with a warm/hot engine.

Researching the site, there were alot of folks talking about the cam position sensor. So I went ahead and pulled it. Upon inspection I noticed that about half of the surface area of the actual sensor seemed to have worn through over time. Looked to be an obvious, quick and easy fix. I got a replacement, popped it in. Made sure the connection was nice and clean. Started right up and everything seemed fine. But sure enough, after a 25 minute drive- the same hot start problem. I turn the key- it starts to crank, then it kind of buzzes and won't ignite.

In the past month I have replaced the battery, air mass sensor, oxygen sensor, and air filter.... not that these are necessarily related. I pulled the fuel pump relay- it looked fine but I cleaned the contacts anyway. It seems to work fine, and I can hear the fuel pump whirl with the key in position II.

The other things it seems I might look at is the fuel pressure regulator, engine temp sensor, RPM sensor. OBDII is not throwing any codes at all. If anybody can point me in the right direction, I'd be grateful. Thanks