It's kind of tricky how to fix this for every character, because making star/screen KOs more frequent hurt the characters that have great offstage finishers but would help poor Jiggs with her signature Rest. The exact opposite occurs if they were removed altogether. Someone mentioned it before but I believe they should happen 100% of the time for every stock except the last one. I think that would fix it nicely.
Even if it's tricky, I'm very sure it'd be well worth the time to program off-stage moves to force upward Blast KOs and on-stage moves (ground/air) to force Star KOs/Screen KOs.
I don't know about anyone else, but I actually did a challenge (an odd one) that involved a Star KO on the last stock. That was actually part of my goal. The one I'm referring to is my 999% match/goal on certain characters on my list.
I don't like posting odd challenges on this thread (and others) because I think they're embarrassing. But for this one, I'll make an exception.
https://www.youtube.com/watch?v=cCBC07o1r5I
Watch at 13:25, and don't forget to read the description too.
Even though I did this challenge, I want to do this for every "Smash" game. I was planning on doing the same for this game too. But because of the randomness on those KOs at the top, it's completely dashed my plans on that. Trying to do that right now would be way too frustrating.
I'm sure there are certain others who want to do certain challenges that involve Star KOs/Screen KOs only, even on the last stock (not like my 999% match/goal, of course), no matter how odd or stupid they are. Yes, I'm actually thinking of certain others too.