If there's going to be stubborness over the advice of experince, then there's no need to ask a question, I don't think that's what is happening here though. There is an attachment to that pleco because ya'll have had it for a while, but I think you would agree it's the life of the pleco that should be any fish keepers interest. And with that in mind, I say this about the Pleco(Not whether or not your over crowding, I have no Idea) Let it stay in your tank as long as it really fits. Once it gets too big, give it a better home. It's important that you make an objective judgment call on that matter.