Hi,
I apologize that this was the impression you got from the Cisco TAC in response to issues with 6.3(1). I assure you, 6.3(1) is a fully supported release and you should not need to go back to an earlier release unless we need to get you back working as a temporary work-around. Note, the temporary keyword here. General Deployment is a different ball of wax here as this is a specification for versions of software that have met several criteria (one of which is at least 6 months in the field) related to trends and DDTS (bugs) characteristics.
Again, sorry for the reponse you got in relation to these problems. You are always welcome to ask for the Duty Manager in cases where you think the answers you are getting a bad or wrong. Have a nice day.
Scott