I did some experimenting today and ended up with two quilt labels that are okay. I used a lightweight stabilizer, which seemed to help. I'll attach pictures.
In one, I used the script font with regular (all purpose) thread...found I liked it better using upper and lower case, so I didn't have to clip between every letter and it actually looks kind of handwritten (well, maybe that's a stretch). It's not very bold, but I was okay with subtle.
For the other one (my grandson's flannel quilt), I used a machine quilting thread (so heavier weight than the other) ... it came out bolder. As you'll see, I used the print (not script) font, so I did have to clip between letters.
Overall, I'm pretty happy with the results.
Script font, all purpose thread
[ATTACH=CONFIG]1542[/ATTACH]
Print font, machine quilting thread
[ATTACH=CONFIG]1543[/ATTACH]