Re: right way of doing sitting kokyu-ho
I think that the understanding of this technique will differ somewhat so the advise you get might not be totally uniform. There are different ways of doing it based on how you are being held. My Sensei shows those from time to time but in the standard kokyu-ho, but with regards to the strength being used against the person, he never needs to change and he teaches us that it can always be done, regardless of how hard uke holds. So far, that has also been my experience. Having said that, I must reemphasize that much of what will be said may depend on how they execute this technique to start off with.
I also never understood this technique until I met my current teacher. He believes in it's fundamental importance so much, that he starts every class with it.