[Is this too big of a bet? -> my thinking these guys held aces, and they wouldn't fold]

Nope, you're probably OK making this play, it's a bit of an over bet but given that this table was loose as a goose that may be a good strat, make them think you're stealing. Figure someone must have an A wiht the whole table playing the pot! On the other side a free card is unlikely to hurt you here, either play probably makes sense. But really you figure an A is paying you off and you're not getting any action from anyone else anyway.