I hope y'all aren't already tired of me posting about my new old birth year Harmony Broadway archtop guitar. In my defense, this post isn't so much about showing off my guitar as it is getting input about strings for it. The guy I bought it from said something about stringing it with mediums and tuning down a step or so for shipping it. However, I was able to pick it up personally. The strings feel like mediums, and the color-coded ball ends tell me it's a D'Addario set. The strings also look and kind of sound like 80/20s, not phosphor bronze. So I'm thinking it's strung with a set of D'Addario EJ12 80/20 Bronze Medium (.013-.056). It's not like the guitar strung with mediums is unplayable to me, but I don't play as cleanly with as light a touch on mediums. Also, the guitar is fairly bright naturally, and some I'm wanting strings on the warmer side of the spectrum. On my other acoustics, I always use EJ16s, D'Addario's regular light phosphor bronze strings (.012-.053). I'm thinking these would really fit the bill. And I already have a supply of EJ16s on hand. The only thing that's giving me pause is the difference in string tension. D'Addario's mediums have about 20 lbs. more string tension that the EJ16s (180.28 lbs. vs. 160.54 lbs.). The Broadway has no truss rod or even steel reinforcement; it's just a baseball bat. I'm wondering if the seller strung it with mediums for purposes of string tension on the neck. So, whaddaya think? I will change metal alloys, from brass (80/20) to phosphor bronze. But should I stick with mediums or 13s for the sake of the neck, or would 12s be okay? Oh, and if someone wants to steer me in the direction of flatwounds, I'll consider that. But I've never used them in my life, so it might take some convincing.