Liquified filament is thick… don’t think its travelling that far up the hotend… but I could be wrong.
You need to be careful with this. The hot end is designed for the nozzle to basically jam against the heat break with the heater block acting like a coupling nut. If you leave a gap between the nozzle and the heat break, plastic will ooze from both the top and bottom of the heater block. It will also be much harder to clear and old color out of the hot end when changing filament.
With the wrench, you’re not affecting the nozzle - heat break gap. It would move the complete lower system (heat break, heater block and nozzle). FWIW, I just tried on a spare nozzle… and while it can move the lower assembly, it’s intent is probably to hold the heat break to tighten the heater block/nozzle.
The stock placement of the heat sink fan is more than adequate for the job. Pointing the fan down towards the heater block increases the potential for jams by over cooling the heater block. Wrapping electrical tape around the heat sink will probably prevent air from flowing through the heat sink because the tape will block the exhaust of hot air.
You’re right the heat sink fan is fine for the job… with ABS. Search the forums for heat creep issues with PLA…
No one said to wrap the tape completely around the heatsink… only to the sides (leaving the back open) to guide airflow.
No one said to point the blower at the heater block. A 1mm downward angle will still make the blower hit just the heatsink (and the thicker end-block)… the lower side of the heatsink where it REALLY needs to be cooled.
Heated filament swells before it liquefies… therefore jamming in the heatbreak/heatsink. Don’t believe me… remove the nozzle with the hotend at temp, let the filament cool 5-10 degrees so that its solid - you’ll be able to push the filament through the heater block, but won’t be able to pull it back through the top. When you examine the pushed through filament the end is slightly swollen, cutting the end off by 5-10mm… allows it to be extracted through the hotend.