Is creating two different categories not an option then? Or even just requiring in game time for a run that is top 10 or whatever place you feel is high enough? It would help to build a competitive environment for those who want a really high placement while also avoiding giving certain runners an inherent advantage.

Wouldn't it make the most sense to use in game time for Individual Levels? It would be the most fair way to compete and it avoids some weird situations where the faster runner is placed lower on the leaderboard. An example is https://www.speedrun.com/ssbu/run/zxgnv38y vs https://www.speedrun.com/ssbu/run/yd69npxz. The first user was objectively faster but is placed at 5th instead of 3rd.