The stand looks like you built using rocketengineers template or similar? Racking should not be an issue with that design IMO.
More than likely it's just your patio out of level. Set it up in it's final location and shim it level on the floor.
I would also put a foam sheet between the tank and the stand.
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80g Deep Blue Rimless - http://www.reefcentral.com/forums/showthread.php?t=2651295
225g Reef Savvy SPS Dominant - Retired http://www.reefcentral.com/forums/showthread.php?t=1945361
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