Can you post some pictures? It's possible there's a oil galley compromise and a stream of oil is escaping under pressure.

Is it possible to observe the engine when running or is it under a complete cover?

The 80 psi may or may not be a problem. What oil are you using? I'd use 5W-20 until the bearings clearance themselves - probably the first 10-20 hours of run time.

I'd also hook up a temporary mechanical oil pressure gauge - you can "T" off the top/rear of engine behind intake (1/8" pipe thread) or above oil filter there's a 1/4" plug - just to verify the reading on the stock (electric) gauge.

Let's keep after this - others will chime in I'm sure.
Glenn