All of the above I feel is very true; there are so many variables.
I also noticed some differences with cymbals when the humidity suddenly changes. Itís mostly playability in my case it seems. I feel it is the wood stick that is affected and it doesnít seem to respond as it should which could change the sound of the cymbal.
There are so many variables we deal with in the drumming arena. We notice this in the way we choose our sticks. Each type feels a little different to us; the design and wood type (I use oak) can be affected by humidity in different ways. I donít know anything about the density of woods but Iím sure one type over another can be affected differently, even human beings can be affected by the way we breathy which affects our mobility. I know I know I DO need to work on that but thatís another subject.