I figured out where the leaking is coming from and it's on the draw back after squeezing the bottle. With a 306 there is not much surface area for extra juice to go....ultimately it slowly creeps down the 306 hole and onto the needle assembly and then subsequently goes everywhere. Now that I've tried it with a 510 the leaking Is less bc even if I overfilled the juice can still lay in the 510 housing as opposed to the 306 which has no housing at all. That was a ..... to find but also I had ton realize it's not a reo, so that means the extra juice won't go back into the bottle , it will just flow down the side. I didn't find this issue out of being smart lol , I got lucky when I saw the outside of the bottle was completely soaked during a squeeze while the bottle was assembled in the unit. So that's something you guys want to check out if you're having huge leaking issues like I was