An old-timer told me the same thing years back, said my edges looked like a beaver got to them. Slowing down and hitting the form line with a wet sponge before it sets made a huge difference for me too.

$180 well spent. Grease was never the problem, your family is.

Learned that same lesson the hard way on some 6061 last year, thought I could feel out the right rpm and ended up with chips welded to the cutter and a finish that looked like a beaver chewed it. The chart is there for a reason and my ears clearly went to a different school than my eyes did. Guess the old guys in the shop know what they're talking about after all.