I don't use the clams/cams...
except when I need the winch for tightening down a halyard. I put one or two turns of the jib sheet around the winch, trim as needed, then wrap it on the jam cleat. Go around the forward end of the cleat first, one full turn around and pull it snug. Quick release when tacking and it has never let go on me.When tacking singlehanded, except in heavy air; I tack, let the jib backwind and help blow the front around, get set on the new course, then tack the jib. In heavy air, the front gets blown down to fast, taking you broadside to the wind. In that case I let the autopilot handle the tack and I manage the jib sheets as I go around.In case you get too far down, you can ease the main to stay upright and trim it as you bear up on the correct course.Fair winds,Tom