BGTV8

You need more air thru the rotor.

Your sig says you have the stillen kit and that is only 50mm hose - you need 75 or 100mm

You need to direct air into the centre of the rotor and that requires a backing plate to make sure the air is definitely directed into the centre of the rotor. You should be able to modify the Stillen backing plate to suit larger hose

Oil temps at 270 degrees is too close to the edge and a bigger cooler is needed. Ideally, oil temp should be within 10-15 degrees of water temps