Would highly suggest a stove top thermometer be placed as someone mentioned, and lets see what temps are being hit, that will tell us a lot. The Rockland has been around a long time, its a nice heater, sometimes over sold due to the firebox isn't that big, its more like a mid size insert. Having said that though, Jotul has been around since 1853, they make good stoves. If the stove is hitting the normal temps (400-600 deg) then its simply not enough stove. Insulating around the damper area, keeping as much heat in as possible I'm sure would help. I know you don't think its the wood, but stove temps will determine that. If temps are getting there, the insert is doing its thing. If they don't, i'd question the wood. It sounds like excessive heat loss around the insert, or its just too small a heater, could be a combo. Good luck, you bought a good product.