Test 18650 cell capacity at different rates: what's the optimum rate of discharge?

Today I'll be testing the LG 3350mAh 18650 cells at different rates: 200mA, 300mA, 500mA, 700mA, and 1A. I want to find out which rate is the most accurate, yields the best result, and at the same time takes the least amount of time. Warning: this contains graphic material. Tread with caution.