My stack temps last year were 1400-1600 for a good boil...anything less and it wouldn't boil good in the flue pan. These are internal stack temps. Called Leader and they said yes they were high, but if it's boiling good don't worry about it. My syrup/chord ratio wasn't any worse than anybody else's.

I find it odd that your's are that low...maybe you're not getting a good draft?