So in my example in reply #7, the correct kettle addition would be simply 0.7ml total?
I don't think its going to take that much. I think it will be the difference in the acid rate times the mashing water volume, not kettle volume. But do check my assumptions with actual trials and measurements. I haven't done so...yet.
Thanks, Martin. I also looked back at the thread Jim mentioned above, and it provides anecdotal evidence of people (Jim and AmandaK I think) getting the desired result with the larger amount of acid. I'll have another data point to add (one way or the other) in two weeks.