You may have already seen it, but I discussed how we dealt with our door gap on this page of my blog. Scroll to just above the midway point, and you'll find a small section titled "Fine Tuning the Doors."

Part Four, Assembling the Roof, Windows, and Doors

Basically two thin pieces of foam weatherstripping, and a few clamps from Harbor Freight, have worked great to hold the doors snugly shut for 6 years (even in very bad winds.)

Thanks,will post a pic tomorrow of my gap.