Jake,
I set my cleat so that it can only be cleated if I lean in and lift the sheet into the cleat. It is impossible from the wire. When I tack, solo or two up, I commence the tack while still on the wire. I then reach up to the trap handle with my forward hand holding the mainsheet. At this point the sheet will ease slightly, this can't be avoided and helps the boat through the tack. By the time I'm in on the tramp the boat is already through the wind so it's a case of straight across and out the other side. Get hooked on and sheet in as you get onto the wire. NO NEED TO CLEAT AT ALL.

I'm very comfortable with the standard mainsheet system and having tried a centre system once (on a Unicorn) I'm in no hurry to try it again. The A is a fantastic boat but I hate the centre main.