I just took a look at the pic. Your not cooling the hot end at all it looks like. I don't either. However I can say that from the pic it looks like the hot end is slanted. I bet your getting distortion on the hot end carriage. I had problems with distortion on my printer as well. Also it was unable to hold a z - axis height because the hot end was moving with heat. I cured it by using aluminum sheet. Dismount the carriage and inspect it for warping. To me the plastic used looks like PLA which distorts after about 55-60c.
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