You do seem to be jumping all over the place Carl
In order your weekly positions: 19 - 20 - 21 - 14 - 2 - 18 - 22 - 5
Seems you do quite poorly in the weeks that should be the simplest to predict, but for the difficult weeks like Black Friday week and week 8 you do really well.
I would argue week 10 is the hardest week of them all, trying to predict the drop after Christmas... perhaps you will achieve top spot that week