But seriously - I just checked 3 Provari's using the edge of a business card as a straight edge. It appears that the 510 connector is the exact height of the drip well. i can slide the edge of the card across the drip well and it doesn't 'catch' on the connector. And holding the edge of the card along the diameter line of the well/connector there's no gap between the card and connector. (that was my scientific/engineering method of checking it).
I'm sure you probably tried everything, but I'll butt in with this suggestion. If it's a DCT type tank can you push the carto down into the tank a bit more. With my Lavatubes, I have to position the carto just slightly recessed into the tank at the drip tip end, so when I screw it down, there is a airspace gap.
I haven't heard anyone talking about this type of problem in the Provape or Provari forums. If perchance your connector is misaligned - rest assured Provape will make good on it. They have very good customer service. I had to send one of mine back and turn-around time was a week, so its speedy too.
I'm still curious what type, brand, kind of tanks you are using. You didn't mention that.