There have been studies showing that low free T can cause more symptoms than low TT. I posted a couple of references in another thread recently.
An endocrinologist suggested that 6.5 ng/dL (about 230 pmol/L) be the cut-off point for hypogonadism. I’m sitting at, or just above that, in a couple of of my blood tests, so it’s possible that I’d benefit from TRT. But here in Australia it’s not looking like an option.