What do you mean correctly with forestat/bridle length.
Adjust the position of the bridle wires in the bridle adjusters so that there is roughly 6" between the mainsheet blocks when fully sheeted.
Ther's times when i've been out and it seems as if the baot is capable of so much more like it's dragging something.
Have you checked the toe-in of your rudders? Do you sail in weedy conditions? Also, sailing upwind with the downhaul too loose will allow the CE in the mainsail to move aft and can overload the rudders causing a heavy feel to the helm (only in medium to high wind though). An on the fly adjustable downhaul system allows you to compensate for this by adjusting the tension of the downhaul as required.