I don't believe in such a thing called "pre-adjudication". You guys pushed too hard and what could you expect them to say? It's why torture is not an effective way to get information, because the one being tortured will say anything to make it stop.
If you can maintain your H-1B, please do so by all means. Don't be fooled by thinking that if you did nothing wrong then they would simply approve your case. For example, you never know whether or not your case will be transferred to local for interview. If you miss their interview notice due to address change (USCIS is notorious in keeping this straight), your 485 can be easily denied. Of course such a case can be easily appealed, but still you do have the risk of being denied for not doing anything wrong.
Another better example: My wife had been interviewed at USCIS local offce almost one year ago but wasn't approved ONLY due to name check. The interview officer promised that my wife was all set and "pre-approved", which was further substantiated by an official letter sent later by the Sub-District Office Director. We should have considered us safe, shouldn't we? Guess what? After the name check was cleared (CLEARED, not COMPLETED), USCIS did another review before approval and found out a voter registration number on my wife. She was called for a 2nd interview to explain the issue and then her case was denied and she was asked to leave the country within 30 days, even though my wife has never filed any voter registration form. In the end, it turned out that the number USCIS digged out was actually from a vehicle registration and the case was reopened and approved.
--So, you think you're safe? Well, given the stupidity of USCIS, you'd better think again!!!