I did the math tonight and with the milled OEM bolt, 3/4" of buffer, and a Lage Tactical bolt shortened about 1.5", the ROF was right at 750 with Winchester White Box. There is indication that the bolt contacts the buffer, but it does not feel choppy at all.
Lost the quick disconnect and went back to the fixed stock. The more I shoot this, the more more I like it! I super psyched for the upcoming subgun match in April.