some food for thought
unlike accuracy plays where you retry a map until you get good accuracy on that map, for speed plays you usually train externally. whether it's on streamy maps like ascension to heaven that you like to play or those stream practice maps that many people uploaded, and whether it's spending a month playing with HR or simply playing a lot of jumpy maps -
in the end, when you get that "1 random play that went into my top performance. wtf. I didn't work hard for it", you did work for it and for quite some time. it's not a play you were capable of doing from your first day of playing osu, and it's not a play that the people you suddenly pass with this rank can do even if they retry it 20 times.
getting rewarded for single tries on a map doesn't mean the map is too easy and doesn't deserve its points and something-p being broken, it just means you are good enough to collect the points this map gives. If you still think a map is imbalanced in the system, call all your friends to try it too.
don't forget that each player has different strengths. a player practicing only streams all day might FC a deathstream maps and then go and say "wtf, this isn't hard took me like 2-3 tries, meanwhile pudding is crazy hard for me and doesn't give much more".
and then another player who spends most of his time on playing jumpy maps literally all day long might eventually get some high combo on a difficult jump map and go "huh, I'm getting points from this random shitty play, but this stream map is completely impossible for me even after many tries and doesn't seem to give as much points wtf?", but in the end you're just getting rewarded for what you're good at.
try to put things into perspective before writing suggestions for this system, maybe ask several other people to play the same maps as you and see how they do on them. you might be surprised at how difficult some things are to other people that look super easy to you, and how stuff you feel is impossible other people can accomplish quickly and relatively effortlessly.