I have never been very patient with just about anything in my life. So while I am waiting for the kapton tape to arrive, I used some aluminum foil and tape to make this heat shield and do the same job..



It didn't seem to help in my problem so I moved onto the next step, checking the passages of the mixing hotend for blockage or restrictions. I ordered a special tool set just for this purpose..



And the 2 short bits should explain why I am now waiting on a new mixing hotend. You would not believe how delicate a .35mm or .40mm drill bit can be.