Karin’s juggle orochi after JFT is just like JFT except with a d input.
JF tenko, orochi juggle should be input as qcf+k~p, qcf+k~d+p.
qcf, d~k~p is good enough as well unless you do the down really early. I’m not gonna say it’s super easy but it shouldn’t be something you’re coming on here to ask advice about either. It’s Karin’s basic punish imo if you have super and no v trigger, because jump fp, s. fp, JFT, orochi xx super is my basic stun combo with Karin. Practice.
For the timing on her c. mk xx jft, this shouldn’t be hard. Do it a little later. It’s not a super late cancel but don’t do it early. If you’re messing it up you’re doing it too fast, not too slow. pop…pop! You shouldn’t be canceling into JFT until like halfway into c. mk. After JF tenko, what I said above applies for the orochi.
I hope this helps but if it doesn’t just remember this: If you’re screwing up you’re probably doing it too fast, not too slow. It’s one of those things you’ll screw up like 20 times, then after you do it a few times, suddenly you can do it 10 times in a row heh.