We keep doing it Smo-Joe because tunes are not composed with a Chromatic in C as a priority ( solo tuned) , which is also the reason some chose alternative tunings or others might use different keyed harmonicas, you can study a tune as much as you like, practice it as much as you like but going from the 7th to tonic is sure to crop up if the tune has to played in G, which means a slide change, breath change and hole change,the 7th is not called the leading note for nothing, it leads to the tonic, except in some cases it leads clumsily, nothing wrong with talking it through and giving it thought, something might click for somebody.
jh.