I'm going bigger on the catch tank. Current 0.5 litre, so can just fit a 1 litre tank in somewhere. Didn't notice at Combe, but mine filled the tank up to 3/4. I've had this tank since I bought the car and with previous engine and this engine it never had any oil in the catch tank.
The vent pipe comes straight off the oil filler cap, so pushing this engine higher up the rev range, clearly pushes oil out of the engine.