So, I actually decided to continue testing different strings on the Kanile'a concert (because I have zero patience and also just love trying out different strings). Just for a laugh, I decided to try D'Addario black nylons since I had ordered a pack and knew I wouldn't use them for any other uke anyway. To my surprise, these are actually quite decent strings, and very surprisingly they seem brighter than the clear nylons which is just bizarre. Maybe it's because the gauges are smaller compared to the clear nylon, who knows. I've previously tried black nylons only on my KoAloha soprano and I hated them because they completely muffled the brightness of the KoAloha. With the Kanile'a, I think these are a much better choice since Kanile'as aren't that bright anyway, so the mellowness of the black nylons probably complements the typical Kanile'a sound much better. Compared to the clear nylons, these also don't lose volume and projection quite as much when played higher up the fretboard (again, probably because of the smaller gauge). Intonation is really good as well, and I like the feel of the strings as I did with the clear nylons. I'll of course have to test these for a couple more days as well but the black nylons show a surprising amount of promise.
I'll probably keep testing a few different types of strings still because I'm thinking of trying to string the K1 concert to low G as well. With that in mind, I would appreciate if anyone could recommend either single strings or string sets for concert scale low G. There's quite a few options for tenors but less so for concerts, so I'll take all the help I can get.