I ran my first and only 35 late this season. It felt so much like 32' that I thought my boat crew forgot to shorten the rope after 32' but it was truly on the "blue". That pass was just an awesome feeling but it came after numerous attempts (~50) of 1, 2 and sometimes 3 buoys at 35'.
For me and watching video to confirm - my biggest change from 32' was attacking the 1st wake harder so I can release/transition sooner. Handle control has been mentioned and it's probably my biggest cause for failure at 35'. I often get separation from the handle off the 2nd wake which I know affects my outbound width and body position in the pre-turn. When I ride the handle out with my elbows tucked, not rush my turn or overturn - that's when I ran the pass. I'm a RFF so the all important start was the key (up on the boat in the glide for the gates, attack aggressively after the ski finishes the turn-in, transition closer to the 2nd wake than 32', keep elbows tucked, ride the handle out... and be patient)! Good luck - tasting 38' for the first time is such an awesome feeling!