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To my ears 2.5 sounds both too rushed and a little too regular - I think ~1.9 or ~2.1 sounds best.

Somebody studied a bunch of recordings and found a mean ratio of 2.38:1. That sounds good on this record too. Further in the article are some observations of a correlation between swing ratio and tempo.

http://kth.diva-portal.org/smash/get/diva2:1246291/DATASET01...

2.5 is sort of the over-the-top classic laid-back sound. 1.25 also works very well and is typically close to what you hear on faster passages in a lot of jazz. It would be cool if this had multiple sections of music to show where different swing ratios are appropriate, like some faster and slower stuff, Bebop and other styles.

That's interesting - 2.5 was the same number I landed on that sounded best to me.

Interesting, usually the ratio is 2 as it makes triplets!