Surprised you didn't check that with the kit manufacturer, i believe Dave or some of his guys would give you the best answer regarding your kit.
How thick chim?
With stock gasket or none?
But if i would GUESS you should be able to run 11-12lbs with only a headchim on straight premium, but it's only an estimate on my behalf as i'm not as familiar with PL kits, go to the source to be sure!