Good advice. I'll play around a bit with it. I use 50/50 almost exclusively. I've noticed that although I've come close to getting the Heron running as well as I'd like, I still run into juice out the AFC, or worse. Today the vapor dropped off and I opened it up thinking it was time to recharge. Discovered juice in the battery chamber. This was with a fluff of about 2.25".
Over wicking can flood the interior of GPin guiding drops of juice inside the battery tube. Clean the GPin once per week from the juice remnants to avoid potential leaks.
Keep the wick tails short, otherwise they will over wick. Generally all Apheroid and Heron builds by using the minimum quantities of fluff and wick you ensure the best results. Fill the chamber slowly, when the fluff's surface is slightly saturated, it's time to stop, otherwise liquid will result inside the base and later in the GPin.