Report as inappropriate

I think the kit with cooling block doesn't have paste because it's designed to fit with their tubing, so there should be no space left for paste.

I've also switched to the all metal, no clogs so far. Stringing at first.

Reducing the retraction is not optional, IMO - the manual should make this more clearly. Too much retraction will drag the semi-molten plastic into the cold end.
I've reduced retraction to 1, from 4mm .