I’m around. I haven’t done much with the GP’s since I posted, but I did swap the FO front for a red ramp blade on the .357 and shot the same loads again. (Brought the S&W 686+ along, too.)
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These are pretty much the average. The heavy 200 gr bullet load still shot high, but this time a tad right (top). The other two were better at 10 yds. (175 gr center, 165 in the X Ring)
In my 686+, the heavy 200 gr loads were spot on at ten.
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The FO sight wasn’t helping, the ramp sight on the GP is better for me. Still, I just shoot the S&W better than the GP.
I think it’s the trigger action. All of my S&W triggers don't stack right before the break like the GP/SP triggers do, so I guess the guns stay on target more consistently through the duration of my pull.
YMMV.
Stay safe.