Something to keep in mind: the Large/Small setting aside, many speakers are not well suited to playing full range information. A speaker, for example, with an F3 of 50-60 Hz will not fare well with the extended dynamic peak of a 25Hz signal.
Common rationale in Bass Management could perhaps me simplified as: speaker protection and optimizing results.
By passing the Low Frequencies to the Subwoofer(s) at 80 Hz, you are ensuring that no signal below 40Hz will be strong enough to harm your speakers. Likewise, in doing so, the power being delivered to your speakers is more effectively and efficiently applied where it matters: to the Upper Bass, Mids, and Highs. My own experience showed me the payoff in that I found more clarity from my Speakers in the Mids and Highs, and the Subwoofers were delivering clean and impactful Bass.
Every system is different, and so are our ears.
Listening critically is a good skill to develop if this is more than just a passing pursuit. I always recommend starting with the XO at 80, OR, at 1 Octave above the F3 of your speaker. (Some recommend 1/2-Octave above.) Regardless, with that, experiment, up and down, with the setting. Listen to music you know with simple but good traits. Good recordings with a demand for Bass, Mid, and High-end detail. Jazz can be great for this, as orchestral, and some Pop. But hearing a clean articulate Upright Bass with a Tenor Sax or Ella Fitzgerald can be quite exposing of what is happening in the transition between Speaker and Sub, and how that effects the reproduction of the recording as a whole.
My speakers that perform down to the mid-20s are crossed at 80. Simply,
it SOUNDS BETTER!
Regardless, if you are happy, then be happy and enjoy. If you want to experiment, do so with a critical ear, and open mind.