Tried again today with a top round beef round - at least that's what it said on the label. This was all just made up on the spot - some cut up red onions, a bit of red cooking wine, a can of beef broth and 40 minutes cook time. Still somewhat overdone as the Thermapen food thermometer showed internal temperatures of 197° F, 185° F and the like. But not nearly as overcooked as last time. Next time I'll try 30 minutes. And maybe skip the broth and just use water.
And another lesson learned - leave the lid on loosely when browning the meat on Saute. Not doing so made a mess of spatters to clean up afterward. Or use the clear glass lid, which I have.
Oddly, the red potatoes were still too hard after 8 minutes, and another 5 didn't entirely cook them the way we like, still too hard, but okay. I think nuking them for an extra 30 seconds or so when we warm them up may work.