I vape 100%VG (well, less flavoring) and I don't find VG gunks up cartos any faster than PG or a PG/VG blend. I do occasionally thin my mixes with DW if there isn't enough flavoring in them to do the trick but it hasn't been my experience that VG fouls attys or cartos any faster than anything else.
True that thick liquids don't wick as well, though - but a VG joose is easy to thin.