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Where are you building? (Sorry if it's in your info, I can't seem to see it in edit mode )Oh, and how deep and what diameter are your tubes? And did you put a footer in (as in a base that is bigger than the tube diameter)?
Regarding leveling. For an easy to use and accurate DIY system it's hard to beat a water level. Either a home brewed system or one like Zircon makes. The strings have to be pulled very tight if one uses those vials that hang on a string.