I have been on a Triumph 69" and have been transitioning to a 69" hO Coefficient SL. The deep starts have been difficult because the ski is 1 inch narrower, but the turns are amazing. The main thing I have found with deep starts is get the ski as flat to the water as possible. Tuck that rear foot up and pressure on the forward foot. I found for me, I need a progressive start or my arms are ripped off or I fly over the top of the ski. I use the power grip. Say in gear, get that ski flat to the water as the boat pulls me and hit it. I tell the driver to advance the throttle smoothly, one one thousand, two one thousand full. With the CoX I even put it up on the wake board tower at first(Wimpy I know) to get the feel for the ski.
Any performance ski is going to be narrower and harder to get up on except for a Carbon V or a Wide ride. I have a Carbon V for sale. Easier to get up on for sure. It is a 34 MPH ski.