I, as usual, skimmed this. The edge change begins to be important at 32, at whatever speed. Now the concept that you can ski like a 36mph pro at 34, pro or not, is wrong. The only skier I have seen edge change "early" at 34, short line or not, was Andy. Safe to say the only skier that skis like Andy is really Nate and it shows.
The key to an efficient edge change is a good solid pull, load on the line. This, in engineering terms, flexes the ski, adds potential to the carbon fiber so the moment you unload the ski it rebounds and goes to the other edge. This is really a movement at or slightly after the second wake.
I would say the biggest thing to work on is when you do get on edge, hold on the handle to the width of the buoy line, then a progressive reach and close at the finish will allow you get the load on the boat, and start all over again.
I would be happy to try to explain more, but this is broad overview of what will help you get the space and time at 32off, even get tons of space at 35off.
Controlled speed is a good thing! Don't be afraid.