I've been doing some more testing with no fish. I believe the unit is operating as designed. The power curve is much longer for a smoker set temp of 225 and that works fine. When I set it at 160, the curve is much shorter, so the end temp does not overshoot the set temp. I ended up with something to try with fish. The set temp is 180 with a chip screen. I put a handful of chips and then chunks on top of that. The chips start to smoke in about 7 minutes. By the time the unit stops smoking, everything is charcoal, chips and chunks. That's only 10 degrees over the SI recommended range for salmon. My glass is half full on this one.