update:
so the starter was on the stir plate for 54 hours. then 10 hours at room temp to settle. then cooled in fridge for 6 hours. decanted and pitched into a Dark Mild OG1038. Airlock bubbling after 5 hours. Going nuts after 16 hours. Going to install blow-off tube now. I've had explosive ferments with this (West Yorkshire) strain. I'd say, so far so good...
But I still would have to make the same batch with a fresh starter to really know...
Guess I know what I'm brewing this weekend...