thanks for the replies, both!
alright, I tuned to ~ -12c @ E2, let it sit for 45 sec, then made small adjustments again to get to +2c, let it sit, adjusted again and got 0c.
this is a weird thing to say, but it feels like my Time knob doesn’t start assuming I want minute adjustments, so it gives 20c sweeps until I sit at the edge for a bit. then the same gesture will give smaller increments/decrements.
anyway, got to E2. and A1. and all over the place, with patience.