I have less experience than the others here, but it seems to me that this may be a case where you generally stand to make a little bit more by playing exactly as you did, yet it is probably best to go ahead and raise because you stand to win a huge pot if one of your opponents does have the 55 or turns or rivers a set. Plus there is also the added bonus possibility of doing a little bit better by betting if your opponents misread you, though this doesn't seem very likely.