Off topic posts have been deleted. Please keep this thread on topic.
"Getting along" for a few days or weeks does not in any way imply that you will have long term success. As others have advised several times, your fish will likely be OK as juveniles... but when they hit sexual maturity it's going to be a bloodbath in there. Adding more fish to the mix is only going to complicate things and will likely hasten the demise of several of the fish. Please, consider re-homing the jag and red devil at a minimum. The pleco also has no business in a 55. The JD is a good choice for a 55, and you could add the convict you want (not a pair, too aggressive and not a lot of space) and another fish of similar size and temperament IMO. Oscars should not be kept in a 55 IMO; nor should any other fish that has the potential to get longer than the width of the tank.
I get that you aren't getting the answers you want and it's frustrating. But everyone is trying to help out here and the answers aren't going to change no matter how often you ask the questions.