Ok DAD.. Stupid question.. Does your system work with a loose foot mainsail? I haven't figured out myself how to tighten the tack of the mainsail without tighten up the halyard in a in-mast furl system. Most modern boats don't have adjustable topping lift without going to the end of the boom and re-tighten it by hand. Not sure how that will work with the mainsail up and out all the way. Seems to defeat the whole purpose of in-mast furling system. I have the same problem on my boat as well and if I tack into the wind with just a little wind coming over the starboard side of the boat my mainsail goes right in. But you are right about a loose or slack in the foot of the sail as it rolls up. I have noticed it too.