Hey Stevo... My 2 cents... If you wanna go fast, get a dedicated slalom boards as well as full race sails

Some of the top end performance of the race sails you are looking at may be lost on said boards. Otherwise, maybe look at 2-3 cam freerace style sails (not used North, some feedback here not the best on the freerace style)... Freerace should be easier to rig and easier to get out of the water then the wide luffs

Freerace may also plane earlier then similar size full race. Full race will probably handle a little more wind on similar size...