Yes, i think so 

Anyway, I just squeezed in a little play time and ran the dumbell with THC off and no change so as I suspected, my ripple effects are all machine related, at least i know now.

I tried dropping the acc to 850, no change so i will leave it there for now.

Then I tried the file for the picture attached, this is the most detailed I have tried yet and was met with total success, the shape matches the file, it has some surprisingly fine detail in it and apart from the metal being some galvanised crap, is just about perfect.

There is some dross but look at it and falls off so i'm not worried about trying to get rid of that, looking at the way the machine was whipping around it, I really dont think more speed is possible so dross is a thing that I live with I guess?