Surlys have really long top tubes. I think a 58 might be too big for you. I find a shorter top tube is really helpful for climbing and a more upright position is desirable for sightseeing. Imagine climbing a steep mountain road with panniers full of camping gear on the back, you'd need to get your weight over the front wheel to make it possible and a too-large frame is going to fight you in this regard. I would opt for a smaller frame with a riser stem and use drop bars with maximum drop dimension. I'm 6'2" and would be inclined to try a 56 LHT frame, or the smallest frame that didn't create toe overlap on the front wheel w/fender.

Your current ride looks uncomfortable to me. Too much weight on your seat. For a touring bike you want better weight distribution between your seat and hands, for example maybe equal weight distribution while riding on the hoods and a bias towards the front when you're in the drops. The worst most painful thing for drop handlebars is to be too stretched out. Having bars lower than the seat is quite comfortable if they're close enough, but not so close they hit your knees when you turn.

Back in the 60's and 70's drop-bar bicycle frames had different geometry, for example the seat tube could be 60cm but the top tube would be 55cm, but currently bikes tend to have same length tubes in both dimensions which is why you see really long seat posts compared to the old days.