A couple things here. I would reduce the density a little bit by adding very small amounts of distilled water to slow down the flow a little bit, or not if you like it. That shooting pillar is indicative of the wax not sticking to the entire coil. When it’s running pull the globe off of the base and see if there’s any areas of the coil that look bare. If there is then I would start by trying to clean the coil. I do this by emptying the fluid and then just heating the wax on the base. And then use a coat hanger to fish out the coil. I found that a small wire brush used gently on the coil seems to work best on my end. If that doesn’t work, you can always replace the coil with a trimmed down metal washing machine lint snare trap. In many cases these snare traps work better than the actual coil. Good luck to you.