My expectation of 1st shot draw times at 20 yds is going to be considerably slower than at 5 yds- with 90% “A’s”.
I’m having trouble visualizing your description of; “….jacket zipped, ………sweeping back, drawing…”.
I’d consider 2 sec A zone hit at 5 yds relatively slow (1.5 sec. as standard) and relatively quick at 20 yds. (2.5 sec. A zone)-with zippered outer garment.
Is IWB position at 3/4 o’clock?