everything i have read suggests that oil pressure is only a problem at low rpm range and once you get into higher rpms the pressure should be sufficent. unless you are suggesting that there just isn't enough oil being supplied to the crank case to keep the bearings lubed. but if that was the case then you would have had problems at lower rpms because oil pressure would be lower. sorry if that comes off as incoherent, i am trying to think this through as i type...
