Here's another idea to chew on: proceed now with purchasing a thermocouple thermometer (or write to a guy you know in Lexington to see about borrowing one). You can then remove the M6 hex socket cap screw on the group (temporarily), and poke a bead thermocouple into the hole. Stuff a little wad o' paper towel, tissue, etc. around the t/c lead to seal things up a little. Let the Alexia warm up with PF in place.
On my Alexia, if I adjust the PID so that the group temp idles at 196F, my shots will consistently run between 199F and 200F, which is what I like. During the summer, a PID setpoint of 222F generally accomplishes this. This winter, while the kitchen temps are down around 67F, I've raised the setpoint to 224F.
BTW, replace the M6 screw before running water through the group
Jim




