Drip tips you buy separately are not like the little rubber tips you get with the Fluxes. They work a lot better. You don't normally get juice in the mouth with them. I bet most of your problem at this point are those little rubber tips.
Go to GV site and order yourself a couple of vase-shaped drip tips and see how you like them. That should take care of the juice getting into your mouth problem in Fluxes and in Visions Reg. if you use the "simple mod".
What you are getting in your mouth is condensation. All mouth tips will get some condensation build-up, but the drip tips you buy separately (good ones, at least) are designed in such a way that the condensation rolls back down into the carto, not into your mouth. Unfortunately, the little rubber tips for the Fluxes, and the whistle tips that come with the Visions, don't seem to work that way. Hence condensation in the mouth.
I can't tell you about the Sapphire thing... The Sapphire is one piece, sans the little plug that closes the fill hole, and they are made of hard plastic, so I am not sure how that would work. Maybe the little plug that plugs the Sapphire fill hole might fit into the Visions nipple, but what would be the point? You wouldn't get any air flow that way...
As for VG vs. PG, that would depend on how thick or thin your VG juice is. I'm vaping EcoPure right now, which is 100% VG, and it wicks fine in the Visions Reg. In fact, I never had any problems with wicking in Visions. I normally vape 30% VG or greater.
i kinda get what you are saying. someone else said something about using the fill tips from the saphires to go into the drip tip and then those fit on the nipple. do those fit in these?
honestly i get condensation in the rubber tips, i even get a little juice in the mouth from the visions. i think what might happen with the rubber ones though is I think they probably are making it air tight and thats causing liquid to get sucked up even more.
so the question is, do i go back to 80-20 vg, i was leaning more towards pg almost 100% as I believe that would wick better.