I think the only way to adjust this heat-sensitive air damper is to go ahead and burn for a few days. Watch the action of the damper and bimetal spring, and adjust as needed..
Each instalation is different,, for example, if your chimney typically would pull a strong draft, say .08" wc, an air opening on the damper of say 1/8" may be plenty to supply the fire.. But if your chimney was only pulling a meager .04"wc, then your damper may need 1/4" or 3/8" opening to provide enough air to feed the fire.. The beauty of your temp sensing spring is that it will compensate for these differences, as long as they are not too large of variations..
I'd just go ahead and burn in the stove, with some thermometers on the stove body and flue, and watch the air damper work, if it needs adjustment, you will be able to see the need.