This question is much like the saddle debate. I think everyone feels strongly one way or other about how a bike should fit. The LHT is very much a copy of old school bikes like the Rivendel Atlantis and some other custom built touring type bikes. So i think its good to search out what builders of those bikes say. Having said that perhaps you should read up on what Grant Peterson of Rivendel Bikes has to say. It worked for me and i just recently purchased a LHT.
My LBS is quite experienced and i take his suggestions seriously,but he was somewhat wrong on my fit for LHT, he would have had me on a 58. He felt my arms werent bent enough on size(60) that i was comfortable on,what he didnt know was that i just dont bend my arms much at all, so if i went a size smaller that he suggested id still not bend my arms much so id just sit up more. I said all that to say that you have to ride what works for you, and dont completely rely on anyones formula. I can ride 58 LHT or 60 LHT. The 60 worked for me best. Im 6ft with 35" inseam. I tend to like large frames with only about a fistful of seat post sticking out,which gets my bars up where i like them. Bigger the frame the higher the bars are in relation to saddle on these style of bikes. I did adjust the bars, tilted up a bit and moved the brakes up a bit on bars as well,making the hoods just a bit more comfy. Didnt need shorter stem. Most dealers will help with shorter stems or whatever so you are comfy, sometimes minor changes like i did makes all the difference.take your time ride several sizes if you can. Best of luck.