New Record victors, how do you train high cps endurance?

I've started my journey of beating New Record, I'm about 2.5k attempts in with 22% (drop wave spam) and 64-100 (after the dual). I also have 50-93 and am very consistent from 42.

But I struggle with the drop, mainly the first wave spam up to about the 40% blind ship clicks. How do you guys train endurance for high cps parts? I can do them, but only a few times in a row beflre getting tired.

I've tried alternating, but I'm just not coordinated for it. Of course I'm willing to learn if thats the best option