I totally understand what you're saying, but based on my experience, I find the Mi-8 is much more prone to entering VRS compared to the CH-47.
With the Mi-8, I’ve encountered VRS much more frequently, even with relatively moderate descent rates. In contrast, I find that the Chinook is far more forgiving in this regard. As long as I keep the descent rate below 700 feet per minute, I’ve never had any major issues with VRS. I personally stick to a 1000 feet per minute limit, and as long as I stay within that, I can avoid the dreaded vortex ring state.
On the other hand, the Mi-8 seems to enter VRS much more easily, even at lower descent rates. It requires a lot more attention to manage speed and altitude carefully, as it seems to be much less forgiving.