I love mellow too, its weird because my mahogany tenor has aquila's on it and has this amazing bright ring tone that is well, incredibly pleasant. Its not plinky or martin sounding at all but just has a bright ring to it that is just really lovely. It's like its a warm brightness? My martin which is Koa, well I expected it to be brighter but instead my martin is way more mellow then my tenor, but the aquila's sounded muddled on it because the instrument doesn't have the same brightness my tenor does. I'm still waiting on my worth browns but I am going to run to my local uke shop and get the martin strings, and another set of worth browns because I am too anxious to wait until next week for mine to arrive, I got my shipping notice yesterday and now won't get them until next week when I thought I would get them today or tomorrow.
Its so perplexing because when I got the martin I thought it sounded more plinky then my tenor but now it just had a totally "different" sound and its like... lower is how I would describe it. It also has a low G which of course makes a difference but its like the entire instrument hits lower in tone.
I have no idea what I am talking about, but its all very interesting! I Prefer my Martin right now but I think thats because I play it the most... and I feel the strings are just not right. Its very frustrating to have an instrument and feel like its not quiet perfect and wanting to have it be so. I don't fault the instrument though, I fault the strings.. but maybe in the end its the instrument? I've never changed the strings on my tenor, love how it sounds. I've never changed the strings on my baritone, love how it sounds. But I know its possible because I took my Moku and changed its strings and went from frustrated to very happy but couldn't keep it due to scale. So there is hope!