There are 2 pieces to sizing.
Obtaining desired temperature is only half of the story. Run time short or long will cool temperature. Longer runtime will improve the evenness because more time to circulate. Short runtime starts to short cycle the compressor, leading to unnecessary wear.
You must also reduce humidity to feel comfortable. That happens from run time. Longer run times from a smaller unit will drop humidity most effectively. Short runtimes from an oversized unit will leave you cool and sticky. That's awful.
This is not like a car where a big engine will get things done quicker. Don't be tempted to "go a little bigger" because it's not a lot of more money. It does not scale like that. You will pay more for worse results.
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