Ok, we reset the jib after each tack to free it from the spreaders. That is, crew sheets it out a tad just after coming across, and in again.
When going into the tack, we tighten the mainsheet, and release it as we point straight into the wind before we begin to cross over. I would say we release about 60cm on a 9:1 purchase system. We also accentuate our weight to help our wide T over by going from the trapeeze, back, and in over the aft beam. Once we get over, the boat has tacked and we sheet main and jib in. Crew is responsible for both, as I have enough to do concentrating on steering. I try to come out of the tack about 5 degrees lower than when in 'pointing' mode to accelerate back to top speed. Are there any other tricks?
Before starts, we set up the jib for windward going, sheet in the main and play the traveller. at -15sec we fall off, at about -8sec we are pointing about 15 degrees lower than pointing mode and bring in the main traveller to accelerate. This all depends on the fleet and distance to the line of course. Any other techniques to accelerate out of the starting line? Not being over early or late is too obvious, and no "drag" from the aussies please

(you seem obsessed with "drag", Pricillas curse perhaps?)