clutch fan gap too short

The parasitic loss of the fan is minimal all things considered.

If the fan is pushing 100 CFM ( just a number for illustration) and you are driving fast enough to push 100 CFM past the fan there would be no parasitic loss. If you are going fast enough to push 150 CFM it could be argued that you are actually adding power to the system.

If you have an electric fan plug it in, it pushes air.
Now use your compressor and blow air at its inlet. With enough air you can make the fan spin faster.
If you measure the current it will be higher without the compressor blowing on the fan and lower when it is.