AZ,,, Sorry it has taken so long to get back to this. I have used Both Massive Choc. Mint and Boba's bounty.. I have had not issues with the juice wicking into the Carto... BUT i do a dry pull every so often to bring juice into the carto so this may be why i have had no issues, You may want to give it a try.. Just a couple sharp pulls thru the drip tip without firing it....
Hmm... I wonder if it is an elevation thing....
or perhaps we are differing in the depth of punch we are making.
Curious...