Mr knots, with your tushy X-15 rig it on the bottom eylet, full down haul, minumal out haul(yes while sailing broad the sail can touch the boom).

Move your mast base back untill you are tail walking and then move it forward 5mm.

If you can comfortably sail up wind you need to rig bigger

If control is an issue try a smaller fin and lower your boom a tiny bit.

i will see you there late arvo. hope it blows all day