I have a D3 X7 65.5 and run the stock settings on fin, wing, and DFT. Ski feels good on both onside and offside turn. I run a leverage Front and RTP so its not quite the same as a double boot. I would have him focus on form and technique before adjusting ski settings. Get a lot of reps on the ski to understand how it behaves and start making repeatable turns on both sides.