I'm baffled. I've used the post for several years with the Brooks, and no problem. I recently switched to a Terry Cite Y, and can't get the nose of the saddle low enough. I mean, the upper and lower elements of the clamping arrangement are actually bottomed out. Thompson provides an index mark and a scale of degrees, and I'm nowhere close to the indicated end of travel, but there she is.
I'm in no way blaming either Thompson or Terry, which kind of leaves the operator. What on earth did I do wrong when I changed saddles.