So for my 1/4 #201-Z cutting aluminum I found I dont even need to use roughing passes anymore with the following settings:
Dewalt Spindle 17500 RPM (setting 1.5)
I never have to use lubricant with the 1/4". My latest attempt with the 1/8" #102-Z I had to lube it slightly but I found it worked fairly well at these settings:
Dewalt Spindle: 16000 RPM (setting 1)
The main difference is prior I was not using lubrication when using the 1/8" endmill but it seemed to work just much better with it. I am actually quite happy with this because upon examining the cut it looks as amazing as I have been able to acheive with my 1/4" bit which saves me a ton of time in deburring.