Slotting is not VG specific. After using a saddle valve hole making
device, I'm rocking two punched holes in my boge 3.0 carto and
vaping boba's bounty 100% vg from it just fine. If your holes are big enough you should be fine. I read that hole/slot sizing has a lot to do with which liquid you're using; all vg juices are not necessarily equal in thickness. I wish I could give more specific advice ... something more than ymmv.