Excellent tips. One thing I've noticed in a couple of your sunbreak speed runs is that you don't ever use perfect rush. Is it just not worth using anymore? I really loved it when it first was introduced in Iceborne.
Roundslash or Twin Blade Combo infinite loops I think generally will out-damage Perfect Rush; there also isn't anything like Velkana's set bonus to give Perfect Rush a damage amp like it had in Iceborne. You can still use Perfect Rush, but the other two are just more optimal. I use Perfect Rush myself because its fun and I'm not aiming to speed run.
Perfect Rush also got quite a significant nerf in terms of damage, especially the last hit changing to a Falling Shadow/Shield Bash instead of a big hit. On top of that, for Sunbreak in particular, Element > Raw as compared to Iceborne where Raw is king so Sunbreak favours attack that has larger hitcounts which Perfect Rush is not
Yeah, I was excited to use the switch skill swap to go back and forth between Destroyer Oil and Metsu Shoryugeki but the duration is so short that it just becomes a massive hassle to try and keep it up.
Zen I love your guides bro, if not for you I wouldn't have picked up S&S in World/Rise ever again. Last time I played that weapon was in Monster Hunter Freedom on PSP back in 2007 hahaha