Can I be forced to close even if I've found something wrong, as long as it's not in the disclosure schedule?

Not automatically. Whether you can be compelled to close despite finding a problem depends on whether that problem falls within something you already accepted — through the disclosure schedule, or a condition you already waived — versus something newly discovered that triggers an unmet condition or a material-adverse-change right that's still available to you. A problem genuinely outside what's covered by the disclosure schedule, and that does trigger a live condition, can generally support refusing to close.

A problem already covered by a disclosure you accepted when you signed the agreement, on the other hand, generally doesn't hand you a fresh right to back out just because you're now looking at it more closely or don't like the implications as much as you did before. This is exactly the kind of situation where getting quick legal advice matters: closing anyway when you had a valid basis not to can forfeit real rights, while wrongly refusing to close without one can itself be treated as your own breach.