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You have a ood understanding of the principles involved and yes reducing the fan speed in this case would likely solve the problem. If you are comfortable pulling the blower swapping a blower motor lead you can do this yourself
If you want specific input on which leads to swap I'll need the brand and model number of your unit
Just kill the power to the unit then refer to the wiring diagram (should be pasted to the back of the blower compartment access panel which should call out the speeds (by lead color) of the several leads from the blower motor. Just swap the next lower speed lead for the one now on the AC fan terminal on the board. And move the one that's currently connected to the parked (unused) terminal the other lead was connected to.
It's not a big deal. It's there to kill the power when that panel is removed so the blower can't run with someone's fingers nearby. Pretty safe bet you won't put your fingers in there with the power on.
Exactly and with the color/speeds called out it should be a snap to swap them with the unused leads on the "SPARE" terminals.
You probably don't want heat on high. Heat is usually low or medium low. I also would not put the AC on low since you risk the coil freezing up if the air circulation is too low. You might want to check that other unit that's working right but if need to make a decision now I'd put the AC on med lo and the heat on low.
Usually needle nose make job easier particularly in tight spaces. The biggest draw back to heat on high is it makes the circulation drafty which can reduce comfort.
Thank for the tip, yes I did get it