Here is a link from Slowinski about oil depletion at the end of the pattern and adjustments that can be made.
This is an excellent article that highlights some of the trouble I was having after game 1 earlier this season when I was starting league using weaker equipment and playing near the 2nd arrow with everyone else. Once the early friction started to form, I was moving in but I was worried about making too large of a move since a pattern change had me convinced that my older equipment wouldn't come back if I moved in too far (I should have known better and just tried it.) When I took advice from here, I made a larger move towards a deeper line I used to play before the pattern change and it worked great. I then got my Vintage DZ and I can start league at 3rd arrow with it. I have it to myself most nights, and Friday was a great example. Halfway through game 2, I left a 4 pin on what I thought was a good shot. The end of the bad friction got dry enough for my ball to jump. Made a 3-2 move to get to the same spot with a larger launch angle. It hit flush again and I stayed there the rest of the night. Getting away from that bad friction greatly reduces the amount of moves I have to make.