So Surging Strikes hit 3 times, right? Then each time should be a crit, resulting with more BP than Wicked Blow. However, it does not land a crit every time it hits, and why is that?

The reason why is because you can't divide 80 by 3, unless using decimals, and the base power of a Pokémon move is always a non-decimal number, unless using boosting items, abilities, or when counting critical hits

80/3= 26.6666666667

Source: https://www.google.com/search?q=80 divided by 3&rlz=1C1CHBF_enUS919US919&oq=80 divided by 3&aqs=chrome.0.69i59j6j0l6.2253j0j7&sourceid=chrome&ie=UTF-8

Also, I'm pretty sure it does land a crit each time it hits

Hope this helped :)