hey mate
with regards to improving your tacking its mostly the sail trim
weight is less important but keep it foward so as not to stall or go over backwards if its howeling, wire to wire if you can
main in tight (this moves the center of effort fowards to help the boat turn up into the wind)
nice controled turn into the wind again to stop the stall
as soon as the jib backs leave it for a second or two to help it pass through the eye of the wind and then at the same time release the main to move the center of effort fowards and finish the tack
once the batterns in the main have popped onto the new side slowley ease back in with the main to fast and you will stall the air flow
hope this is some help
dane
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