QTo in LP vs. 100% vp$ip

[Poker Gestalt]

villain has played every hand since he sat.. posted UTG, cold calling 3 bets, showing down hands like J2o calling down with A high on a QT8J7 board etc. 25 hand sample.

Do I iso raise this?

Preflop: Hero is Button with Q[img]/images/graemlins/club.gif[/img], T[img]/images/graemlins/heart.gif[/img].
UTG calls, <font color="#666666">5 folds</font>, Hero...


at what point would i NOT want to iso raise if your answer is yes? Q9o? J7s?