Thanks very much for the very interesting information about your system.
I think I know what you mean about soft-hard in the same time, because when I took Ukemi to some visitor Shihan, I was aspirated into his circle irresistably but with an incredible softness, and I was led to the Ukemi in the same soft but irresistable, almost magnetic way. The Ukemi itself was very relaxed yet very powerful. It was not painful at all, but the power was quite shocking and impactful, and as you said, I was surprised to be alive as I was getting up.
The concept of giving as little information to Uke as possible is very interesting. I hope that I could practice some day at your dojo and learn more about it.