Hayabusa allows for a lot of free-style from stun, meaning a "set-up" is just you being predictable when honestly, you've got a lot of options. A lot. That said, I'm hearing some iffy things, so here's my feedback (it's kinda long).
First of all, 9K is a bound on CH/from stun, meaning that the juggle follow-up potential is the same regardless how deep in the stun threshold you go. Thus, if you want to go that route, I'd honestly try to pop it out sooner (namely after the 6P+K lift stun) since that gives the opponent less chances to hold out. Especially if they can stagger escape out of my set-up. Note that 6K will not connect after 3K if the opponent stagger escapes. Also, 236P WR 4KP is not a valid juggle on all weight classes from the 9K bound. Learn your different bound combos for different weight classes.
9K is
not guaranteed after 6K. It can't be stagger escaped, but it can be held.
Again, if the opponent stagger escapes, 6K will not connect after 44P.
Like I mentioned earlier, the 9K bound is the same regardless your stun threshold. Why exhibit a different follow-up from it here than before? Besides, on the weight classes where you can apply this juggle from 9K, it's not optimal damage.
Are you giving a combo that begins with 9K on NH? First of all, that will rarely ever happen. Secondly, if it does, you only get +9 from it of the opponent stagger escapes, meaning the 3K usually won't connect. Furthermore, 4H+K can be stagger escaped to only +16, meaning your 9K follow-up probably won't connect (it's a SDS so everyone will try to SE it). If it
did guarantee a 20 frame attack like 9K, you could simply go for a CB instead and get way better damage. But it doesn't.
Also, again, you're making a lot of very, very risky moves here trying to delay the stun threshold when you don't even need to. You're ending with the same 9K bound again. It's the same from any point in the threshold.
Again, 4H+K does
not guarantee a 20 frame attack (like P+K). You
will get stagger escaped for trying it, and you
will get held. Also, if the opponent is stagger escaping, 4H+K won't even connect after 6P.
No. A pro player would stagger escape, since spamming low holds lets Ryu get a full free 120 points of damage from his Yoko (33T into Izuna).
is very fast and safe.
It's 13 frames (standard mid speed), has no threatening mix-ups and is
not safe.
This is the only move that will guarantee a 20 frame follow-up, since it's a very heavy sit-down stun. Furthermore, you can land it after your lift stuns (even if the opponent stagger escapes) such as 6K and 6P+K, as long as your opponent doesn't attempt a mid punch hold.
But honestly, when he asked for CB set-ups, this should have been the
first move someone brought-up, since it's the only move Hayabusa has that will guarantee a critical burst from it. Of course, it's situational. Hills, walls and sheer distance can mess it up. That said, it's still an excellent tool. From there, people should have started sharing set-ups that can't be stagger escaped, and ideally use some nice mix-ups. For example, my BnB CB set-up is:
CH
Can't be stagger escaped, can't be crushed, CB can't be held, max damage juggle, works on all weight classes, etc.