Bob if you are bowling during open bowling this is definitely possible. What you may be seeing is that the track area from 8-13 is already worn in by league bowlers from the night before or earlier in the day. When your not bowling on fresh conditions anything is always possible. I know if I'm bowling the next day after the oil is applied I'm going to be at least 5 boards farther right with my feet and 3 with my target if not more. On the second day I'm going to be throwing plastic and if it's day three I'll be playing my plastic ball on a line like you were with your Optimus. It's really hard to tell much from session to session bowling in open conditions as you never really know what has been done to the oil pattern before you go there.
You may be adjusting into areas that the oil has already been depleted forcing you to just keep moving. One of the nice things about league bowling at least in my houses I know I'm bowling on fresh so if it's way different I can usually be sure it's probably me. Not that lanes don't change from day to day but the changes are smaller than what I see in open bowling
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