My guess is your wattages are too high/you are chain vaping too much. With max VG you have to be a bit... I guess I would call it dainty and delicate.
With max VG in an N2, quite often (depending on coil resistance) I would be at like, 8 or 9 watts. You have to. You also CAN sort of have a longer draw, and also KEEP inhaling as you let go of the fire button, and it will wick juice into the coil as you go. Avoids dry hits, which is what I think you are getting.
You are going to have to modify your technique and rotate tanks to get the results you desire, it's just how it IS. Etc.
I know you have said, again and again that you don't want to add distilled water, but I really think a few drops in your tank might help you--- Help you avoid BURNT which is a flavor you don't want.
Also, I know you are going from DL which you say you hate.... But you need to modify the style of your draw, turn the wattage down, prime thoroughly, etc. That is the life of MTL and 100% VG.
I really don't think it's your tanks necessarily. It's you. Modify.
Anna