Hey there, I`ve got a question, because I can`t really hit Z and X very fast, I can do streams, but not F.I Cry for Eternity`s streams, so I had this question:Try different hand positions, different keyboard positions and if you feel like it change the hit buttons from "z x" to something else.
Is there any way to improve your finger`s speed? Better hand positions etc?
Also play high BPM maps with streams as often as it's possible.
If you still don't feel like hitting such fast streams, think about changing your keyboard to some better one. Mechanic keyboard should provide you AT LEAST 200bpm doable streams. Also flat keyboard is a bit better than regular one while streaming.