It might be good if you dropped the salvini and got a less aggressive cichluid in it's place. you should also try to get a female convict.
A less aggressive cichlid? A pair of cons will cause more disruption than a lone salvini.
To the OP, IMO you are okay for the time being. You have 3 of the smaller american cichlids so you shouldn't face the fish becoming too large for the tank. It ultimately comes down to aggression. If it were me i would lose the RTBS and continue with that stock.