I had to take a dremel with a cutoff wheel and cut slots in the cartos.... the phil method: A PBusardo Tutorial - How I slot my cartos!.wmv - YouTube
You may need to make them larger or smaller depending on your vg ratios. Also make sure you use a really small detail file, sandpaper or something to make sure you clean up the sharp edges on you new slots so they don't cut the o-rings when inserting or removing them from the tank. It works. I'm a chain-vaper and caro's weren't working for me until I started doing this.
I tried cutting the slots vertically too instead of horizontal like in the video and it worked great.. EXCEPT when you slide the carto down to refill the tank, it gives the juice an open drain to leak out past the o-ring so that didn't work out so well... DOA!
edit: Oh yea... almost forgot. After you open up the holes you MUST have the top screw in the hole all the time when using to keep the vacuum/pressure equal in the tank. If you take that screw out, it will let open air into the tank and it will be pretty much like having a hole in your tank, it will simply drain all the juice through the carto and out the bottom of the 510 into your mod. Don't lose the screw and also don't try to fill through that hole with a syringe. That will also cause pressure to build while you are filling and all that pressure goes to the same place.. down the 510 into your mod.
Ok, drained the tank, added 1 slot in addition to the two punched holes that I had made, and it seems to be feeding now. (can see small bubbles during a dry pull, which is what I was looking for) Still a mystery on the darker color I see through the holes / slot, almost like there's a thin layer of something that wraps the white stuff you see when you look in the top.

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