Hi Cam. Long time
Three things I would advise;
1. Bat off leg and open your stance a bit. You get SO far across from middle that If I were your mates, or the opposition, Id bowl around the wicket all day to you...
2. Elbow high when hitting straight. Keeps your shape that way and you are less likely to spoon something straight up or drag the shot across the line.
3. Head still at point of impact. A bit like a golfer, do not lift that head until the ball has been hit to keep the timing and control of the ball.
Also, at one point your mate says 'that cut shot is not always on'. I agree with him completely. Its a very high percentage shot. As you get so far across, it might be worth getting in line and working it into the leg side for a single. Less chance of getting out that way...
However, as I said, that's my advice.