Punts & Extra points

[batman]

I was wondering do you actually punt or use a set disatance on every punt. I use 40 or 35. I'm thinking on my next round of games to actually use the season avg from the last completed year for each team. If they net 33 then that is what they get if they net 42 then that. Thinking about doing the the same for extra points if they kick 19 out of 20 them every 19 extra points its no good.

Just wondering what your thoughts are?

Thanks
Walt