I have an aerotank on my MVP and it will not pull! My MVP shows the word non on the screen. I will get it working for a few puffs but even then I'm having to pull hard to get anything. I've changed coils and cleaned them with no luck and tried different vv/vw. I also have a cheap tank and it leaks every time I'm outside. I'm having zero luck lately and I'm so very frustrated and I'm getting close to my breaking point with it.