Funny, mine are always the same size...
I think we all do............... I've had tabs that were laid too strongly at about 250micrograms each, so if anyone took 2 they were destroyed, and if anyone took 3 it was too much. I want that to happen again.
Ive never had a visible size difference between blotters either, usually around 6 by 6 mm, very tiny. As I am in the netherlands and we have these places we can go where they test your drugs for substance, purity and dose, I know áll of these tiny hits contained LSD, in doses varrying from 40 ug to 400 ug (I've seen a lot of blotters, 400 ug only happened once, áll the others were under 200 ug and most under 100 ug).