That's not an error message (though, FWIW, I can't replicate that message: I only see "X too long" when that's applicable, and 72 chars is well under the 80-character length limit). The submit button should be enabled, and you should be able to click it to submit.

AFAIK, if you're logged in and have a title that's of acceptable length, you should be able to submit. Any flagging or whatnot happens after submission: there's no filtering that happens before the submit button is clicked.

If you think something else is going on, or there's something that's affecting your account, I again suggest you contact the mods directly. If that is the case, they're the only ones who are going to be able to confirm and address it.