Tommy, naw man i highly doubt it will harm it. i do it every time we surf and a buddy has a 03 (non-TE) and they fill the same way to surf.
stock ballast: 820#
sac ballast: 400+400+1000= 1800#
so now i have added a 500# over the center hard tank and a 350# on the port side rear of the floor.
i have to fill the 1000# nose sac up a little more to get it to plane but the port side wake is really looking good now. good length, good push. i know im going to have to re-prop it, but my question now is... what prop to go with? i want something that can be used for both surfing and boarding, get me out of the hole better when im loaded down, help RPMs.. and i never get over 30mph. any thoughts?