i really dont have much idea but here are some of the points i use generally, (but not as a rule) as all conditions vary some what as Haggar has mentioned. 40 knots in flat water is alot easier to handle than 30 knots in the open ocean.to small a fin in chop will lead to more chances of high speed slides as there is not much fin in the water when the board leaves the water,flat water on the other hand should handle a smaller fin for the same breeze strength.
lots of down haul i guess would be good for lots of twist.only just enough outhaul to take the slop out of the clew, too much outhaul will take too much camber from the sail allowing the sail to back wind easier as the draft will wander aft in the gusts resulting in the old face slam to windward scenario.
mast step forward more than normal to help keep the board in the water and help engage the rais through the gybe.
as the mast goes forward you generally have to adjust the boom upwards to maintain comfort and controll how ever its generally good to keep the boom down slightly according to the experts.
the other tips i find useful are wearing things like helmets and lately i have started using a life vest (np model in maxed out conditions) which gives protection to the ribs and floats you higher in the water for water starts and rests etc.
the other thing i have found in max conditions in big chop is the difficulty of keeping the board from launching into jumps.. some times you just got to go with the flow,when you get air a straight rear leg will kill the hieght of the jump and tend to keep the body over the board instead of to the side which on landing can end up in a swim how ever landing a jump with the leg straight will also end up in a slide if you land sideways so i guess its a fine line.
basically vando has summed it up well..its really a case of getting as much time on the water as possible.
f..k that was along winded piece of bull sh.t...