Carto tanks are the bomb.
When I first joined the ECF and started my vaping journey, almost EVERYONE was raving about the Vivi Nova.
I bought one, couldn't wait to try it out... and was let down so, so, so, so hard.
Then I got a DCT tank to try out. I was still dripping at the time (went from crappy stardust clearos to dripping, I was beyond frustrated with clearos), but didn't know how to properly prime a cartomizer.
I hated my carto tank at first, thought I'd gotten burned. But then my local b&m store taught me how to properly prime a carto (+/- 20 drops), and bang... instant flavor. None of that burnt gookiness from wicks and the heads from the Vivi Nova. Pure juice flavor. I still have my Vivi Nova (it's genuine, got it from Madvapes), but it's unused. Waaaaaaay too much fuss when it's supposed to be "fill and forget" easy.
It is not.
I've got five tanks for my cartomizers. Love them to death. They kept me from getting discouraged and going back to real cigs.
Oops, I didn't offer an answer to the OP's question. In my opinion, and don't take it as verbatim, but the higher the VG, the higher the viscosity of the juice, and that might make "wicking" or "soaking up" issues a bit muddled. I vape 80/20 pg/vg and my carto tanks work perfectly.