If you're forcing that much oil out on wot runs, it sounds like you have a crankcase ventilation problem. If the pcv system is not providing enough ventilation for the crankcase, the pressure that builds in the crankcase can force oil out of perfectly good, even brand new front and rear crank seals. Tell us more about your pcv system - is it stock?
Yes the PCV system is dead stock.
Valve new?
Yes, new PCV valve
Is the screen/oil trap under the valve new?
No but I did clean it once before. Good Idea I'll check again.
If that screen is clogged up (as most are on higher mileage engines), it will block the flow of crankcase pressure/vapors to the pcv valve and cause pressure to build in the crankcase - forcing oil out where ever the weak link is; and often the weakest links are the crank end seals. What about the tube from your valve cover oil filler neck nipple to the throttle body - is that still functioning as well?
Yes I still have that installed. There is however more vaccum present on the valve cover side though than on the TB side. Is that the norm?
It also vents crankcase pressure when you're under wot. You say all gaskets are new/low miles -- did you also replace the front and rear seals when you did the other work?