Great set of useful and action-oriented questions! It takes some practice to accurately interpret a candidate’s answers and get the deep level of insight you describe, but they‘re definitely more useful than many of the stock-standard questions out there today.

Depending on the role, there’s one more question I find as useful as the 3–4 above: “What do you wish people knew about you / your project that they don’t?” I’ve written some about why I love it, but short version: it’s an unbeatable gauge of a candidate’s self-awareness, ability to be honestly introspective, and willingness to think from the POV of others.