This an exterior chimney right? If so you'll benefit greatly from a blockoff plate or at least some roxul packed up there.
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I had a similar problem with wood my first season. Some was good, some wasn't. One thing I did towards the latter part of the season was to get a good hot fire going with the best wood and then feed a couple of splits of wood that was upwards of 30% in. That way the secondaries and flue stayed at high enough temperatures. I lost some efficiency with the wetter wood and the glass got a little darker than it does now, but my chimney had no creosote when I cleaned it.Some of the wood has dried out to 18-20% moisture, although some pieces are still ~35-40% and are taking their time. May need to split some of the larger ones down to speed up the drying (AKA the "I need to go buy another Fiskars axe" argument).
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