Well.. the samples are too small to say definitively but if the rates hold up when the samples are bigger the only thing I could think of is that TH works in tiers... And the tiers would be your 3rd or 4th reroll. I guess that would kinda make sense for SE. We would see no increased drop rate on standard trash mobs because they would die before TH procs, but anything that took a little while to kill would see the benefits. From your numbers I would say 1 tier would be at TH7 but it's extremely early in the sample to make that kind of assumption. I'm actually excited to see more numbers now.