After going to bed I kept thinking about the final finished project, and when looking back at my original sketches, realised I preferred the imperfect quality to the cold hard lines of the computer. So I traced over the whole thing, fixed a lot of the curves, fleshed them out better, and put it back into Illustrator. Much happier with this final result.
Really happy with this fix for the wording and spacing, as I think this helps a lot with readability. Ready now to experiment with thick and thins in the cursive parts, and then move onto colours and textures.