Since it's starting while you're still under power, I'd say it's most likely windage. Most of the oil getting wrapped up around the crank. We dynoed a motor without a windage tray, then with a basic one, then with a really good pan with full tray, and left and right scrapers. From start to finish 40hp different on 1100hp. Without the tray at 6800 the oil pressure would go 50 to 80 like a hammer and the motor would bellow like it was under changing loads. The basic tray let it run clean, and not wad the oil up, but the last pan was still 15 hp better than the basic tray.

I'm not an accusump fan either. Just a crutch for a solvable problem.