I'm speaking for myself when I write this, maybe it applies.
My right arm is my dominant arm, capable of achieving a speed completely insane to me. However, my left arm being my non-dominant side can't even achieve half the speed that my right arm can go. And for that reason, I don't play really high speed maps that my right arm can "vibro" (I put it in quotes since there is hardly any control) because my left arm would fail to compensate. Also doesn't help that this left shoulder has been dislocated more than once.
Now my fingers are a different story and I am mainly a finger tapper, but the message still applies in that I don't worry about what my best is capable of doing but rather what my worst is capable of doing. Your left hand kinda sucks at 180BPM trills? Cool. Just keep exposing yourself to left hand trills and it'll eventually work out. Though at the same time, you need to make absolutely sure your timing doesn't get skewed from being too fast or slow, keeping position. Timing between taps is absolute when doing trills and streams imo. So if you're kinda just tapping and hoping the speed will work out, don't. Try to keep in timing.
Also ngl, your right fingers also had such a bad start that I can hardly actually tell the difference between your left and right hand, I'd label it as dumb luck that you got in timing.
Once you missed with your left, you boosted its speed so you were hitting greats with proper timing (albeit a bit shaky), so you're more than capable of doing it. Just give it some time.
