I have been using the "Pin Score Saver" App for this. I believe it was created by a Pinsider. I just record my score from the first game of the day. I think this simulates a tournament setting best when you have to walk up and play a game without getting dialed in.
This app is pretty cool. I wish it also charted a 4-point running average to smooth out the inconsistencies.image.pngimage.png