I really doubt your getting floated at these stakes that lightly, some opponents possibly. It's ok to double barrel this occasionally, but default I think your going to be bleeding money. At most I would barrel this 1/3rd of the time.
It's just one man's opinion so take it for what its worth. I also would advise trying another site besides stars. A twitcher by the name of Fooz said he makes double the amount of money on 888
as he did to Pokerstars, so maybe entertain the thought of trying multiple sites, weird tangeant. I know in general Pokerstars games are tougher than U.S. games, well maybe not WPN, but everywhere else.