Thanks for the reply. I've got an update.
I received 2 new 510s (in black) along with a bunch of spare carts. I wanted to try the slug mod one more time with fresh everything to rule out the equipment.
I took the foam and cut it 1/4" wide, and 3/4" long. The thickness is what it is. I filled the cart to the lower lip of juice, about 6-7 drops. I made the "U" with the foam and stuck it down there. Topped it off with 2-3 more drops. The foam is saturated but not pooling.
For this cart, as a test, I placed it open end down on a paper towel. I immediately checked to see if the foam transferred any juice. It did not. I'll be checking in a few hours to see if it's leaking.
For my second test, I did the same exact thing but the foam was a little wider (my cutting was not 100% straight
) and performed the same steps as above. For this cart, I connected it to a new 510 atty (black) and went to town. Right away I had a flooded atty, leaking juice in the bottom of the cart and when I removed it, juice all over the outside.
Clearly this mod isn't working for me and I suspect it's the usage (me drawing too hard?) Maybe it's my liquid (Liberty Liquids from MyPVShop.com.)
I have some tasty vapor juice coming tomorrow that is 10% VG. I heard that this juice is thicker, so maybe I'll have more luck.