If you're shooting good consistent groups (slowfire groups that are no more than 2"-3" at 15 yards) and not seeing any significant change in the overall POI when you up the speed (even though the group sizes grow a bit with the increased shooting speed), then I would be tempted to adjust the sights to bring the groups on target.
That said, most of the time when I see this kind of thing, the shooter is not getting consistent or tight groups. If the groups aren't tight then the issue is almost certainly recoil anticipation/flinching and that needs to be addressed before adjusting the sights.
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