My initial guess, without being able to actually see it, is that the large gasket between the tank and bowl may not be the correct one. Is this the one you said you purchased that was generic? If so, you may have to find one that is a closer fit to the original. I'm just curious why that was replaced in the first place...that gasket rarely needs to be changed.
The bolts that hold the tank on the bowl, should have rubber washers and the washers should be sitting on a clean surface; any dirt could cause leaking. The bolts should be relatively tight but do not overtighten because the tank can crack.
If you need further help or clarification on this question, please reply to this post.
Best of Luck, Brian
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Architect
Licensed Architect- 12 years, L.E.E.D. AP, Former Remodeling Contractor- 10 years