The symptoms aren't representative of the sealant issue, that would be a chronic lean presentation. Don't get impatient or frustrated, I can imagine how apprehensive you must feel wanting to make adjustments but not sure which ones to make or if they will help or hurt something. You are doing fine so far and I feel progress is imminent, everything seems to point to a rich low end needle and if one is not that experienced with adjusting these carbs, going slow and in small increments is much better than the opposite or you could chase it for a much longer period of time. It's also very common for engines to communicate that they want some attention after a few flights as parts are starting to lap themselves together. So far I haven't heard anything that would cause me any kind of alarm. Keep at it.