I experimented last weekend shooting over 800 rounds. I would say the results were very surprising.
I went from Bob Vogel’s death grip to almost no grip. Suprisingly, my gun flipped more as I gripped the pistol harder. My hands were constantly breaking as I increased pressure.
Having said that, I held the gun like I would hold on to a bar while standing on a subway. Very neutral. No added squeeze whatsoever. Along with this grip (hand pressure) I straightened my arms out, not bent, without locking but extended and applied a firm push/pull. Not too intense either, just enough for my palms to be in contact..
In short, my very relaxed grip without squeezing, with a bit of push/pull, arms extended out, made my gun flip less than when I gripped it really hard.