The solid tool post got me through for a while on parting
I was recently reminded that loose spindle bearings are the hidden culprit in parting issues. A friend had unending problems getting decent surface finish on his rebuilt Atlas 10. In the end it was spindle bearings not tightened enough. I recently fixed the same issue on my KC1022ML (G0602 look-alike).
Tightened up and my parting problems went away 600+ rpm now with lovely chips. A bonus is better surface finish even 100mm from the cuck on 50mm round stock.
Gerrit