Howdy and congrats on the V2, lots to like there for sure.
First to the feeding. As has been stated above, the most likely problem is 'new guy loading' issues, harder waxes feed just fine normally. The problem comes from the cart being cold as the just warm enough wax flows down, hits the cool part, and 'clots' up right there. You now have an air bubble under the wax, noting is moving and you'll mess it up by continuing to heat it electrically.....stop that! It's not working.
The problem is the wax is cold and heating it will likely trash the seals in the cart. You need to be very careful, it's much easier when the concentrate is in the funnel and you can preheat normally. But here goes:
The seals we need to protect are near the bottom, above the thread insert, at about the 1/3 point. The plug and air bubble just above them, way too close for comfort. And comfort is what we need to use as a gauge. Hold the cart by the bottom half, fingers and thumb below mid point, open end up. Twist the cart back and forth as you heat the tube above your fingers. Keep the cart moving, let it get warm but not uncomfortable under your fingers, the seals are just under there. Keep the heat on the top half, SS conducts heat poorly, it'll take a long time 'coming down' through the wall of the tube. If you feel the temperature suddenly rise, that's the clue the hot concentrate has dropped. In normal loading (where you preheat the bottom then quickly move up to the funnel and heat the load) this cue can work well, but here the change might be too hard to sense. The best plan it to keep it from getting too hot to hold without saying nasty words. Go slowly but keep moving. Expect to take half a minute to do it with a typical lighter.
Then try it again, but remember continuing to heat the dry wick is asking for trouble in a couple of ways. It might start feeding fine....and leaking even better. After trying to melt it down and failing I've inverted it, melted what of the load would come out back out. Let everything cool, scraped the concentrate back into the cold funnel and reloaded again from the start with proper preheating, I recommend that rather than risking too much heat on the seals.
As to the 'high limit' issue, I've got some bad news for you if you're new to vapor? You're taking in THC, even if the concentration is low, taking in more means taking in more. You can get mighty drunk on beer. That's the way it is. Twice the number of hits of half the strength vapor is same amount of THC. What is missing from the process is the poisons that come with combustion, perhaps that's the issue here? The high from vaping the bud rather than blazing it is different.....takes a lot less too.
That should get you started, anyway.
Enjoy the tool, it's a useful one.
OF