Resteal

[Fred Allen]

I posted this about a week ago in the MTT section and did not get a response. I am trying to understand resteals better, or what are the minimum requirements for a resteal?

In a $300 MTT LIVE with the blinds at 200-400 last night I held J7s on the button.

The CO, who seemed very competent and aggressive, open raises to $1600. CO stack roughly $11K, UR stack $9000, and the blinds were roughly $5000 each. IS J7s enough and if so how much should I raise? If J7s is enough then how low can I go to resteal?