My V2 never affected group size in fact on one rifle it may have fluked a tuner effect and the group improved a tad but that just may have been a fluke on the day.
POI always shifted up and to the left generally around 1.5 to 2 moa. And that was on an FO truck axle, CZ 223, K31 so a range of barrel thicknesses. Although the V2 was suppressor mounting capable I never got to test mine with a suppressor so cannot help you there.
Shot several details of FO with it attached. Obviously had to adjust the zero but scores were unaffected by having it attached. YMMV
Overall a good Chrony except for having to do final zero with it removed. Far superior to any optical Chrony.
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