Just a thought
As I was building one the other day and epoxing in the nylon screw I had epoxy left over, so on a whim I coated a toothpick, an ran it up into the mid tube, putting a thin coat on the inner mid tube section where the PTFE spacer would have gone.
As far as the hot spot on the leg wire, I have seen people double those over and twist the excess, so when the kanthal leaves the wick it is twisted double strand to the post. I have seen this in other mods to reduce the wire heating up between the post and the wick in lieu of NR wire.. Might give that a try.
Also check to make sure a strand from the Pos post is not sticking out and touching the mid section. Ran ito that also.
Dan