Math SL for these courses is definitely appropriate. Only Math Studies might potentially hurt your application if you wanted to apply for these courses, and if you took Math HL it wouldn’t actually ‘boost’ your application. Math SL is even appropriate for studying medicine. Math HL is recommended if you are planning to study e.g. physics, or engineering. THEN Math HL will boost your application. Based on your interests, why not choose Biology, Chemistry & Business Management as your HLs?
Finally, getting a 7 in Math SL is much better than getting a 4 in Math HL on your diploma. You can get some nice college credit for it, too.