I was thinking of comparing Iteration X, Week 2 with Iteration Y, Week 2. So progress between iterations for the same week for the last set. So e.g. you did 8x140 on week 2 of the DL, then did 9x145 on Iteration 2. Obv there will be natural variation due to external factors and one shouldn't be too results-oriented on every single day, but still interesting imo.
ETA: looking at your spread sheet, your progress seems pretty