I've found that it's unneccessary to remove the tube from the carto completely, but rather, cut slits in the tube above the connector and below the cup with a Dremel cut-of wheel. This enables the juice to get into the wick and adds stability/rigidity. I've also determined this is less likely to damage the atty from the cup sliding down the air tube. It does make it necessary to cut the syringe (or other tank apparatus) to the exact length needed to use the drip tip, tho.
Thanks for the how-to! I may try this for my next tank mod to see if it's more user-maintainable than the clear bottle mods I have.
Congratulations on making a "Gummy Tank"