Is that 1 1/4" copper pipe?
I don't remember...
If I do remember correctly though, someone here built it.
...a couple years ago, ...maybe.
I've so many reference pictures that it became hard to keep track of the who, where and when of them all.
I realize it runs great. Video shows so..
It may run smoother and more efficient with added heat.
The insulators do work to remedy the exact issue you noticed and described in your video.
I thought I'd post to let you know what has worked for me in dealing with the same issue.
Speed and Velocity of the mixture can be friend or foe.
Heat tries to befriend and aide Speed or Velocity.
Your heat is free for the grabbing. What's to loose in running insulators for a month or so to know if what I'm saying is true?
Tune it your best without...
...then try it with.
Chances are great that you will notice a difference and need to retune.