So now that it's a few weeks down the track I can categorically say the only problem with this installation was the dead viscous fan.
Have done some serious towing, off road, varied driving and it hasn't gotten hot or missed a beat.
Settled with boost at 20psi for the sakes of sympathy on a high mileage engine but from around town to off road, freeway speeds, towing, hills and everything in between the difference from the stock turbo is amazing.

