Another few infusions later, I can confirm that this one wants a longer first infusion, even better when handled properly. About 150 degrees, 1 minute plus to start; 150 degrees, perhaps 45 seconds for the second; and gradually increasing time & temps through 6 or 7 infusions.
150 °F / 65 °C
1 min, 0 sec
I know this is ancient but just wanted to give a big thanks for sharing your steep parameters. I was struggling with this tea until I found your tasting note!