I am almost certain the tinniness will go away with age. A lot of guys sound tinny and thin after being on T for a while. You'll notice that old people, have more mellow, resonate voices than young people, and when they get really old, their voices are thin and kind of raspy. Part of it is lung/ribcage size, but people's voices do change a lot out as they get older, perhaps from vocal cord use. I don't think we would be the exception. It just seems more obvious with us for a while because we go through the tinny stage as adults rather than as teens. I think advice that tells you to avoid certain words or intonations is sexist nonsense, sorry.