Hi everyone... I really need some advice. I am a BIG TIME beginner to windsurfing. I have used gear I am trying to learn on. I think it is workable gear.

I'm 240 lbs 6'1" in Texas with 10-15 knot winds typical
Sail 12.5m cam-ed sail
Board - Fanatic fun bat Lite ( older long board )

Now, I have had a lesson long ago, but my only success recently is that I rented a board (wide board) with a 6m sail in the Florida keys... I was able to go out and back several times and stay upwind in pretty light wind ( it was exhausting though)... That being said, it was VERY difficult for me to get the board to reach and impossible for me to get a run... it really wanted to point and the only way I could get back DOWNWIND to where I started was to pull up the center-board (dagger-board) and sort of crab downwind... the board tip simply would not aim where I wanted it to.

So I finally had enough wind to get out on MY rig today. I am able to stand up and up haul on this board with this big ass sail, but it isn't exactly easy. However It seems like no matter what I do, the board points upwind and even tries to back wind the sail! I am trying to bring the rig as close to vertical as I can ( not leaning away from me) and lean it forward as well, but the damned thing still wants to go straight upwind!

I have a moveable track and I have tried putting the base all the way forward and all the way back... Oddly enough, I had the most success with it far back so that I could stand further forward on the board without sinking the bow.

I have tried with the centerboard up and down with no noticeable difference.

I have tried grabbing the boom further and further back from the mast ( to drive rig forward) but if I go too far the wind just twists the rig out of my hands.

This is so frustrating... I thought It was supposed to be hard to stay upwind, but for crying out loud I cant lay off!!!

I would appreciate any suggestions... Also, I have about 6 inches I could move my rear fin fore or aft.... What effect would this have? it is all the way towards the stern now. should I move it up?