Well, seems my video card is screwy (recent, but cheap HP laptop). Sometimes, when entering the SM, the pattern shows an additional white block, or the block is in the wrong spot (video card is confused). Disconnecting the external monitor and reconnecting corrects this.
But the blacks look very gray when in the SM, as though the black level isn't matched (connected by HDMI). Not able to find such settings on my computer, but in this state it sure doesn't seem to give a proper result after the ADC calibration. Starting settings were 134/71, after calibration it becomes 79/120! Blacks look great in the SM now.
Anyway, plugged in the original values and looks to be back where I started. Maybe I'll give the Oppo a try next.
My understanding is that I should get a result around 131/71, correct?