How realistic is it to sit in a STT say 6 seater and only play premium hands, AA, KK, QQ and cash?
I have been trying this but have found that the field start to pull away and my stack just gets blinded away. Then when I catch a big hand I don't get anya ctiona s my table image is of a very tight player, now anyone who has played against me knows thats not the case

Opinions on how and at what levels to vary this.
You could try playing maniac style - open raise with any pair, most aces inc small ace suited, any 2 broadway and suited connectors. Always continue if called. If you survive long enough the table will begin to fold a lot and even if they call, they will fold to the continuation. Needless to say you will have to asssess the situation if your flop bet is called......