I have an 03 21 i tige, with Rival ballast. What I do is fill the back bag and the front side(depending on which side I'm surfing). Then I try to get a bunch of people in it. I would reccomend putting whatever you have for weight in there, all along the side you will be surfing. I would make sure you have some weight in the front too. On mine I usually have to bring the taps down to like 4-5 or it gets too washy when there isn't much weight up front.
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