Cyn, I stopped buying KA bread flour & now add pure gluten to their AP flour.
I've used both Hodgson Mill Vital Wheat Gluten and Bob Red Mill's vital wheat gluten.
I typically add 1 tsp of Hodgson vital gluten per cup of AP flour. Not sure where I got that ratio from because the Hodgson box doesn't give that specific answer. It just says to add 4 tsp PER LOAF of bread (add to the dry ingredients and continue with recipe).
From the Bob Red Mill link for Vital Gluten, comments say to use 1 TBL per cup of flour. Also, this was in another BRM user comment:
" 'Bread machine' flour is what they used to call 'high-gluten' flour, back before that was a bad word. I use regular flour and add a half tablespoon or a tablespoon of this."
A friend told me that the pizza shop where she worked added pure gluten to the "bread flour" for their pizza dough to make it extra chewy. I haven't tested out that theory, but always wanted to.
This could be a quick test to avoid costly shipping fees.
PS: Bonus perk: sprinkle gluten across the entry into your house to effectively block those annoying FAKE NEWS "I'll die if gluten touches my lips" wannabe's from entering.