OP: I don't think anyone was suggesting that what you took wasn't actually acid. I'm pretty sure the placebo comment was about being able to tell the difference between different purities of acid based on the bodyload.
Anyway, the only real different "kinds" of acid are names for different purities. Nearly 100% pure product is super rare and mostly gets taken by the chemists themselves and their close friends; that stuff is called needlepoint. White fluff is a step below that, and below white fluff are the three main commercial varieties: silver, lavendar and amber. Some people, like mkat, say they can tell the difference because the impurities have some added bodyload. There's no conclusive evidence that there is an active degradation product that could cause this, but there's no conclusive evidence that there isn't, either. For most people, though, assuming what they have is LSD and not some other drug being misrepresented as LSD, the only thing that really matters is the total dose of LSD - if the crystal it was laid from is less pure, then more weight would be needed to get the same actual dose, but that doesn't really matter to the end user who gets a tab of unknown potency.
It's notoriously hard to gauge the dose of LSD tabs, since even most highly experienced users have never had a single dose of truly 100% known quantity. The best most of us can do is compare how intense a given dose feels to how intense past doses have felt, to get a rough idea of how potent a batch is.