Interesting. For my finishing passes, I have a Dewalt DW660 1/8" 3FL at .0625" DOC and .01" WOC at 40ipm. What are your thoughts on these feeds? I get a bit of chatter here and there (could be my tool path), but the part generally turns out like in the final picture the bottom part. I assume the top part in that picture is after it is tumbled? How long do you tumble your parts, I usually tumble mine about 2 hours in a rough media.
Looks great though, I’m definitely thinking about spindles more. Do you have a link to the one you are using? Is it one of those chinese ebay ones? I was looking around and they are like $250 for a 1.5KW 
I’m trying to get my quality dialed in, any tips is much appreciated! This is most of the aluminum I’ve done so far: