The fan mod was blowing too low for me either - you’ll find an updated design that works very satisfactory for me in the regarding thread: 3DP Part Cooling Fan 5015 Replacement - #192 by Hauke
What I would like to know from those that have the new printhead already: is the feeder cog wheel detachable from the stepper motor axis? The old one is basically the stepper axis itself, and if it gets worn out by abrasive filament, you’d need to replace the whole stepper motor. I hope they have learned from that and now offer a replacable cog wheel…