Which Manometer did you get?
Dwyer Manometers are only around $30+. There are many links on here to order them online or get on the loaner program.
On some of the Keystokers, there is a little HEX/Allen Head Screw in the corner of the ash door to check the draft.
If not, you can check it in the exhaust pipe just behind the stove in a screw hole or something. Depending on the adapters you might have to put into the pipe.
Scroll thru this thread, a lot of good info on the Manometer setup and what/how to measure itmanometer install
Keep adjusting the feed screw in (Clockwise) while it's calling for heat until you have 1" or so of ash and that would be max feed rate. You have to check it after an hour or so, it will take a while to FINE Tune it.
Do you have a thermostat hooked up and how far away is it? If you have it turned up too far, it may never be satisfied with the amount of heat loss you have having or you are not feeding enough to get it hot enough.
Plus, you are probably loosing a lot of heat out the chimney without a baro damper, the hotter the exhaust, the more it will draw the heat out of the stove without it.