So if it only takes 10% + - to correct the PH of the mash to 5(-ish), would this be enough to give the desired "sour mash" taste profile? Im having a hard time understanding how these two factors work together. Can anyone clarify that such low backset % in the mash will give the desired taste profile or how exactly its done by the "big boys" ? I have heard that Wild Turkey adjust their mash to around 5.8 at the start of mashing. Then they add 33% backset when the mash goes into the fermenter, which gives a PH of 5.1 as the yeast is pitched. BUT, In my very limited experience it would seem that 33% backset would drop the PH through the floor and dilute the OG of the mash. Apparently Wild Turkey said that it was a matter of quantities, but surly a 250 galling mash would work the same as a 20,000 gallon mash as a percentage?
I have also hear that in the wet milled cornstarch extraction industry it is common practice for an acid steep to be used as it reportedly increased starch yield by around 35%. So considering this fact would it be a safe assumption that a greater % of backset would produce a greater extraction of starch. But f this is the case then would the dramatically lowered PH inhibit a good & full ferment. I hope you can see why Im a little confused.