PJs,
Below is a photo of the improved surface finish after doing the various lathe improvements to eliminate most of the machine vibration. This example is a surface cut across a 3" diameter section of 6061-T6 aluminum. The cross feed rate was 0.0006"/rev (at 660 RPM and a finely honed HSS tool bit) which is very fine but also provides a lot of opportunity for the vibration to show up on the finish and I don't see any in this photo. Also sprayed once with WD40 for the aluminum cutting fluid.
I hope this provides some encouragement to make the changes to your lathe.
Paul

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