With the length of my nose I believe I could still get my nose on the string of a 31" a-a bow.[:-]
You would be surprised at how much better and more consistant your anchor would be if you got rid of the kisser and just used the corner of your mouth and the end of your nose.
Find a consistant spot to put your release hand and you will be amazed.I myself use my jaw bone.If you look at what most pros are doing,you will see theydon't use kissers,reason,they are too big and therefore,less consistant.That being said,I saw a picture of Dan Mccarthy and he was using a kisser.He is the only pro I have seen using one BUT he is also winning everything in the ASA right now.Just goes to show it is a personall choice but you don't know untill you have tried both.
Basically what I am sayig is to experiment and see what works best for YOU.