From your pictures and my non expert eye your vents do look pretty small. I wonder if one or two more in the middle could help thing while still keeping the temperature high. Do you get condensation during the day or just overnight when it cools off?True. The exhaust air coming out always feels really sticky. I’m also still getting condensation inside the kiln... I guess I’ll wait and see where it’s at in a couple weeks. I think I’m going to give it three weeks this time before I check it again.
At some point though the limit might just be how fast the wood can transport moisture from the inside to the outside of the split. I don't know how much temperature affects that process.