best advice i can give, is despite what everyone says, take one thing, and focus on just that to start, then pick another if you are trying to do 3-4 things different you will not fix it.
I would def start with a wider gate however to work on being early to 1 ball, then continue to try to be as early to each buoy as you can. Once you get the gate down, move to the next item to fix..ect..ect