Oil cooler

Now the cooler is SOOOOOOOOOOOOOOOO important, after only 30seconds at WOT power I can drop the pressure quite alot, have been keeping the runs short and only doing them with coolish oil, I can smoke the oil in under 2minutes I think using 7500, 10psi at idle from usual 20-22psi!!! As such I found another cooler today. Will adding the best oil I can find too at next change and getting as much wind on the cooler as possible!.....