Have you tried launching from a beach or shore instead of the busy boat ramp area?
In my teenage years, I sailed a Sunfish. On busy days we would just carry it over to the beach and launch from there. Plenty of manuverablity, no other boats to contended with, and no ramp to get in my way.
A boat ramp is generally not needed to launch a small boat.
You should be able to do it from shore. (Unless the shore line is all rock or similiar)
Courtney is My Hero
If a man is to be obsessed by something, I suppose a boat is as good as anything, perhaps a bit better than most - E.B. White