ON the Baro, there is a weight, set it approx. .04 on the scale, then adjust your speed (or some, there is a plate that you adjust for the draft) on the power vent until it just start to open on a 3/4 to full burn and check your manometer for .04 approx. Then the baro will fluctuate when/if it need more or less draft.
Yes, the more the speed, higher draft. therefore, the baro will open MORE to reduce the draft on the stove and maintain whatever you set it at (.04).