Looking for advice from a top level riven player

Hi guys, I'm mainly looking for some clarification on some of, what I personally think, is the more complicated combos on riven, and mainly the ones in this video. Now I am able to preform some of the needed combos, such as E -> R -> Hydra/Q and such for engages as well as some other combos, but I am completely unable to pull off the combos in this video.

Although I have looked at a ton of text and video guides I still cannot get these combos to work one time. I have spammed hours and hours in custom games and in normal games and I cannot land these combos. Even with all these guides my main issue is in the actual rotation of the spells, what I mean is the order and timing you cast these spells. In the video I linked it shows for example Q-Q-W as the first combo, and I have tried casting Q then Q then W, and the W does not go off until the entire animation of the second Q happens.

Same with casting both R1 and R2 during a second or third Q strike. Although I can do the R2 into third Q, but not like in this video, as in the video it appears to be casting the R2 mid air of the third Q, and not before the third Q. I have tried all these combos with different rotations of spells and timings and cannot get it to work still. For example with the Q-Q-W you see at the start of the video, I have tried Q -> Q -> w, Q -> W -> Q, and Q -> Q/W ( same time ), and I cannot get it as fluid as this video and cannot get the stuff to go off without full animations.

I know I am not the only one having trouble with these combos, and I cannot find a guide at all that explains exactly how to do them, but instead just types what the spells are in the combo. So I am looking for some slight clarification on how these combos are pulled off. The main combo I am interested in, and assuming a lot of other players are the Q-Q-R1, Q-Q-Q-R1, Q-Q-R2, and Q-Q-Q-R2. So after this whole post explaining the situation, the main thing I am curious in is the actual rotation and timing of spells casted. For the Q-Q-R1 for example, me casting it in this order as fast as possible just results in no canceled animations and R1 goes off after the entire second Q animation goes through. Me casting R1 inbetween the 2x Q's results in R1 animation going through entire phase and the second Q doesn't go off, and trying to cast second Q and R1 same time results in second Q going off, but no R1.

As I said I have spent literally hours and hours and hours spamming these combos in different ways, different timings and I cannot figure it out. Is the rotation of these spells used exactly how it is listed in the video and I just suck enough to not get these rotations out right? Do some of these spells need to be cast at the same time? Or are these combos solely about understanding which time in the animation to cast another spell? I've tried casting my R1 in a Q-Q-R1 combo at so many different points in the Q animation, and cannot figure out the timing or rotation correctly.

Any help to the timing or rotation of how these spells work will greatly benefit me, and assuming others to. I will continue to practice these combos in custom games in attempts to figure it out, but with out knowing the exact rotation or timing of these spells I am just wasting hours, and close to days to figure it out with no success yet.

Thanks in advance.