Lots of things will define your tone ie , the bass, your amp , your speaker, your settings , etc, but a heavier gauge string won’t necessarily give you a heavier tone , (by heavier tone I’m assuming you mean a deeper sound ). I play some pretty heavy reggae and dub and I get a perfect tone from 45-105 flatwound and 45-105 tapes . I’ve probably tried most strings over the years and I think a lot of it is just trying different ones until you find the ones you like, I’ve spent many nights trawling through BC marketplace and eBay at 2 o clock in the morning looking for strings 😁 I found mine in the end 🙂