If I lift the tank up, there is some "wiggle" in the hinge.
No chance you forgot one of the washers is there??
-Only reason I ask, is because I had my tank off over the winter to get internally sealed, and when I remounted it, I initially forgot one of the washer/spacers and it had some wiggle side-to-side....All set after I put the washer on...
-If there is some tweakage, maybe try an extra washer??