Iboiv001--Sorry to hear you had a bad experience on your first time out--it shouldn't be that way. As you found out, the area within 4 mi around Cedar Key is shallow except in the channels. It is very difficult to use a paddle as a rudder if you have a full sail up in significant wind--just too much sail power to control with your makeshift rudder.
Coincidentally, another thread "Rudder Loss Solutions" has been revived this weekend http://www.hobiecat.com/forums/viewtopic.php?f=71&t=47343
You might check that out. It appears that you have an AI and not a TI. True?
Why did your 1000#-test rudder line break (popped)? It has happened to others, and I just don't understand what is going on.
One thing you want to do on your next trip--maybe in your back yard before--make sure you are cleating the "down" rudder line very hard. That is, as KB has said, the rudder line must be pulled tight (hard) before cleating. If the rudder is not pulled down hard, it drifts up, trails horizontally behind the stern, and makes turning the tiller very difficult (can this break a rudder line?) Since the rudder is not deployed properly, wind helm--turning into the wind--is the result. When cleated properly, you should not be able to manually lift the rudder up towards horizontal.
Best wishes that your next trip will be totally successful.
PS If you have room, I strongly recommend a trailer for hauling your AI. It makes life for the AI/TI sailor much simpler. Also, be sure you cinch your Hobie seat up so that it supports your lower back. Both my wife and I use the Hobie seat and have not experienced back problems--from the seat, that is. Now lifting an AI/TI onto your car, that is another proposition.