I'm by no means an expert "Docker".
However, a few tips that have helped me.
Your speed docking should be the speed you want to be going when you hit the dock.
Swing out as wide as possible and get as straight a shot possible at the slip.
"Fenders" or "Boat Bumpers" are your friend. I have 6 of them tied in the slip in addition to the molded plastic ones that are bolted to the slip.
I also put two out, port & starboard near the bow and then I've got two of these on the front of the toon.

I don't use them on the sides as I like that the round ones will 'roll' a bit when docking.
These work great on the bow of the toon.
Also, if your toon has an electric trolling motor, that works wonders as a "Bow Thruster" when it's a bit windy and the wind pushes the bow of the toon one side or the other when trying to slide it into the slip.