Here is what i would do. I did an identical prac like 3 weeks ago...
10 drops alcohol
10 drops carboxillic acid. spelt wrong.
4ish drops conc sulfuric acid.
Heat everything for 3-5 minutes in a test tube over a bunsen
dunk mixture from test tube into cool water.
smell that ester!
And: yes concentrations will impact the smell. if there's too 'much' then the ester will not really smell what it is supposed to smell like... the components of the smell are to far apart if that makes any sense...
i worked with 'banana' a couple of weeks ago, and one sample was much pinker than the others - and almost blew my head off... it smelt ghastly while the others smelt of those lovely lollies...
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