I built a smokehouse last year. Spruce tongue and grove outside 2x2 frame 1 1/2” insulation and spruce plywood on the inside. I welded a firebox and lined it with fire bricks and have a three foot pipe going to the bottom of the smokehouse to hot smoke. I have done quite a bit of smoking in it and always get an off taste in the meat. Kind of like feeezer burn taste. I thought it may be because I was using charcoal chunks for heat and a bit of wood chunks for smoke so I went to using strictly hardwood for heat and smoke. Not sure where I am going wrong but it’s driving me nuts. Any help would be appreciated