I have a better question, how do you feel the kisser button will make you more consistant? If you already have a peep using a kisser button probably won't help much in reality. Especially if you anchor it to the corner of your mouth which can move quite easily from shot to shot. If you are not lined up perfectly your mouth will move to find the kisser button.

If you want to shoot more consistantly install a No Peep on your bow, or use a smaller peep.

Or pay more attention to your form and current anchor points. Blind bale shooting can't hurt either.

And when you shoot, do you center the pin in the peep, or the housing in the peep? If you center the pin in the peep a kisser will not work to well for you because as your distance increases your anchor points will change slightly.

Paul