Here is an image of the Master Brioche dough. I followed the recipe exactly using
a scale and on the second version, I had to add an extra 2.5 TBL of AP flour. It was perfect after that. It had been raining here for a few days so that may have affected the second batch.
I also converted the Hi-Gluten flour step to avoid using a scale:
For 300 grams of Hi-Gluten flour, measure 2 CUPS of AP King Arthur flour. Remove 1 TBL and 1 TSP of AP flour. Add 1 TBL of Hodgson's Vital Pure Wheat Gluten. Whisk to combine.
My KA mixer did ALL the work. Takes about 35 minutes, then I just dumped the dough in a plastic tub, pressed plastic wrap on top of the dough, covered and left it in the refrigerator overnight. I used it up over 3 days.