Kenny, did you read this thread?--- Vermont Castings Vigilant I down... :( for now... :)
Also can you describe your chimney and where the stove is set up?
Aslo where are you measuring the tems????
That L shaped door you took out has to be in to keep all air flowing up thru the coal bed. Also are the passages behind the fire back clogged (ever clean them?) the oval slots on the extreme rt ride (as you look in) in the exit when the damper is down, It then goes thru an S shaped set of passage ways back and fourth behind the fire back to the exaust port. Every thing on the left side of the stove including the little door thing must be mudded up well with furnace cement.
Do you have the hopper?
As for draft. Mine runs fine with .02 to .03" of draft in weather above 45 and at the same baro setting in sub 20deg it increases to .05" on a manometer.
And to keep a stove top temp of around 450deg, my flapper at the back is only open 3/8"
Not to harp on the hopper thing, but with out it you'll be filling it constantly, and if you load above the rear and side grates you risk the possibility of burning thru the read fire back, if you load it up a nd bank the coal against the fireback.
I took mine out one winter to replace the hopper throat pieces while running it and it ran no problem, I heaped coal up in the middle of the fire box while I repaired the hopper.
When I get home from work I'll post the manual and stuff I have in a PDF file .