Oil Pressure Drop Help....

I finally was able to take my car "Home-Brewed" out for about a 4 mile drive this morning.

Runs pretty well.

BUT... I was logging the drive by way of the F.A.S.T. XFI and there seems to be an OIL PRESSURE problem.

I am using Rotella 15W 40 oil.

8 Quart pan and external pickup standard volume melling pump.

At Cold start the pressure is at 70 PSI.

As the engine warms up the pressure slowly drops to around 25 to 30 PSI. I can live with that.

What I can't live with is that after I accelerate pretty good and back off the pressure is dropping to near ZERO.

Sometimes it comes back up Sometimes it dose not.

Could the relief be sticking?????

ANY Guidance will be appreciated.

"Dart67"