This being our first year wood burning I just want to be cautious as some of our wood is in the 25% range. The snow melted off the roof so I climbed up to take a peak. We have been burning almost every night and 24-7 on the weekends since mid October. Is this an acceptable level of creosote after that amount of time? It is flaky and comes off easy the couple bare spots in the pics I brushed with my finger.