Your question has been answered to my satisfaction and learning has occurred.
I shot D1 to a an IDPA target striving for my max speed with a taped Gen 3 G17, a RTF2 G17 and a Gen 4 G22. Ten repetitions each.
I did not have a the hot hand I had last weekend but I was running D1s in the range of 1.02 to 1.20.
One factor the same across all 3 guns was vision. At this speed all I'm seeing is a blurry slide on the target with some blurry front sight reference. Not really my style at all.
But it became clear to me that the Gen 4 with no tape (and no back strap FWIW) was superior for me.
Taped Gen 3 - only four alphas and the rest charlies (if I 'm generous and call upper alphas charlies ). And some of those charlies were "bad" Cs. WAY out of of the alpha. Three were really bad grips and all three really bad grips put the shot in the upper alpha. Nice looking hits if I was aiming for it.
RTF2 - only 2 alphas. Two deltas. And again the C's were often bad Cs way out. Just terrible. Several badly fouled grips. This surprised me a great deal.
Gen 4 G22 - 5 alphas and the balance Cs and they were all "good" close charlies, most in the high chest just above the A zone.. And not one badly fouled grip. My mechanics were similar but I do think with the Gen 4 texture my grip slipped into an acceptable grip at the draw.
So damn, this was eye opening.
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