I shoot with a kisser and without a peep for hunting.
I also use a pendulim sight (one pin theory) I have always been able to hit what I am shooting at but this year I moved my pin from vertical to horizontal in the swing. Since doing this my groups have tightend up.
Another benefit of moving the pin is that I get a crosshair effect with the string and pin, eliminatinglooking to the side of the string to see the pin.
Once the horizontal pinis on target it tells me if my grip is twisting the bow.
I have attached a picture, you can see the cross hair effect with the pin and shadow of the stringon the wall.
Good luck and happy shooting.