Might colleges and universities not consider me for an assistant professor position because I'm a professional tutor in addition to being a teacher?
I decided it was time for a career switch to academia,[...], due to a strong passion for teaching.


As others have already mentioned, 


sending out 32 apps and getting one interview might actually be a good success rate in physics. 
your absence from academic research for 10 years (if indeed you've been absent in the publications game) is a much bigger issue than your private tutoring service. 


But I wonder also where you're applying. If you're focused on teaching, but are applying to R1 schools where research is the main focus, then you're less likely to get any traction (especially if you indicate this love for teaching in your applications). I realize that this sounds awfully cynical, but the fact is that at research-focused universities you're competing with people with heavy research profiles and an unbroken sequence of postdocs and publications. 

At a more teaching-focused school, it's possible that your tutoring experience will be viewed as a positive, because it demonstrates a track record and commitment to teaching.