Yes, this happened to my Fireview and once I fixed it, it was a whole different animal. .75-1 is where I ran my Fireview and it would only get up into that 700 range at the lower end with no flame. The Keystone may look similar fire box wise but there's one big difference, the Keystone has a small 1/4" hole drilled into the back of the ash pan housing that allows a little more combustion air into the fire box. I have found I can burn the Keystone on much lower settings than the Fireview on the same chimney. I also think the Keystone has a little more control than the Fireview and I've had many less OH CHIT moments.