Attached is a plot of today's anneal. If you compare it with some of the other here:
you'll see the temperatures are much tighter. I achieved this using the bypass only opened to 0.3, the run opened to 1.3, and the pumping valves closed (because I forgot to open them). The top still kept creeping up, but this is the closest we've gotten to consistent by far.
There's a bit of a hiccup where the separator runs out of liquid just before 16:10. I fixed it by opening up the separator flow to 30 and the temperatures came back together. I would keep the separator wide open in the future.