Tim, How well does your Miyata fit? If well, it is your best guide for a touring fit.

My initial T bike build essentially had the same set-up as my then distance roadie and became a little less aggressive with mileage. This maybe due to my sight seeing attitude while riding it, but it also increases it's versatility.

In the past 40 years I've read dozens of fit guides and honestly didn't understand some of the authors' logic. One thing apparent with so many schemes is that there is no one true method. Over time I've come to consider the saddle/pedal relationship and TT length as the basis of a proper fit.

Brad