If the rails were playing different any pro would be able to tell after a few hours of play, if you didn't notice a difference until after you lost then it's just an excuse. If 30k was paid off and 50k was bet between dozens? of people on the side then it'll never get paid off if it hasn't been now. If it's the same/similar issue he had w Archer then Oscar isn't gambling on pool so much that he's gambling on whether or not he'll ever get paid even if he wins. The more people involved with the bet would FORCE you to make sure ALL of each side is POSTED, otherwise BOTH sides are gambling on pool and payment even if they do happen to win which is nutty.
Oscar should've asked the owners permission to adjust the table, now if Guama owned the table that'd be entirely different. One ball was hit a bit over pocket speed and went backwards instead of into the pocket which shouldn't happen on any 9 foot table.