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For what it's worth, no I don't use black-hat techniques. I recently purchased an expired domain (I didn't know it was previously owned) which has still not been included in the index so I thought it wouldn't hurt to just submit a re-inclusion request, although I would have expected at least a standard boilerplate reply.
Or maybe I'm just being impatient. Who knows?
This is for a site that was totally banned with no pages in the index. If your problem is that you're indexed but not ranking, I'm not sure a reinclusion request is going to do any good.
And as I always say, it never hurts to ask someone else to take an objective look at your site to see if a fresh pair of eyeballs can spot something you don't.