Olsson Block Leak on 2+

[killmelast 0]

Hello, I recently acquired Ultimaker 2+ and noticed some material is leaking between the Olsson Block and the hot end isolator. It doesn't really happen at lower temps when printing PLA but does happen at higher temps when printing CPE/PC/etc. I took apart the headblock to investigate and found nothing noticeable. Upon putting it back, however, I noticed that the installation instruction calls for the following: 

 

"Make sure the hot end isolator just covers the screw-thread of the Olsson block; there should be a small gap and they should not touch each other."

 

(1) Is the leak normal for Ultimaker 2+? It's substantial enough that I don't think a quality long print is possible.

(2) What's the risk of tightening the Olsson block without a small gap with the isolator? and would that solve my leak?

(3) I think the issue could also be related to my extruder. Is there something I can do in my settings to minimize the leak?

 

Thanks!