Step forward
As you make the turn, you should be able to step forward to unleash the windward line, let the jib come around, then cleat or winch it off before it fills with air. The process should take 20-30 seconds depending on wind, how fast you turn, etc. The trouble with trying to do it all from the tiller or wheel is that you have no leverage to release the pressure on the windward winch. Hence the need to step forward. It's like a dance, with one-step forward, one step sideways, and step back to the tiller. Skippers singlehand up to 40 feet, so you should be able to master this with a little practice. Just watch out for that pesky boom as at swings around.