I bought a bit before it was put on the controlled substances list in my country. A good demonstration that legal LSD doesn't end the world: it was legal, it was LSD, the world didn't end!
As a retired neurosurgical anesthesiologist (38 years) who has never taken LSD or any psychedelic/psychoactive substance, I found your observation very thought provoking.
More likely than not, the LSD on each unit on a given sheet is chemically identical.
Therefore, the only variables are 1) the amounts in each dose, and 2) the substrate on which the drug will act (i.e., your brain at a given instant is — on the whole — the same, but functionally totally different from second to second as pathways activate and connect).
I would therefore hypothesize that, more likely than not, most if not all individuals who have a strong response to a given dose of LSD will have different responses to repeated doses from the same sheet.
I'm hoping people who've taken LSD will school me.