Ooof. I totally feel for you on this. The answer(s) depend upon the material. I completed a few parts on the xsTech in aluminum (but I would not recommend doing so, unless you are REALLY patient). Wood and foamed PVC didn’t seem to get bogged down with a “reasonable” DOC and WOC but the cut quality suffered from a bad F&S or suboptimal tool for the material.
In PP on the 440, it will generate a speed and feed (may not be the best one) in conversational based upon material and a given tool # (you should be able to use the Tormach tool # in your offsets). I don’t remember that feature being active on the xsTech but it could have been due to it being on older firmware.
I have licenses for GWizard, HSMAdvisor, and millalyzer.
Of the three, millalyzer might be the best option for the xsTech to be able to fine-tune feeds and speeds once you get the author to build out a model of the xsTech (given the limited rigidity and spindle power). If I were you, I think I would pay for that, patiently wait for him to transfer in the actual physical model of the xsTech, and maybe use the free web version of HSMAdvisor in the meantime, maybe buy it.
Tormach is partnered with GWizard but I use a Mac, so I had to fire up Windows for it or HSMAdvisor’s dedicated clients (where millalyzer has clients for all the major OS platforms).