While my above post was meant to get a slight chuckle it is essentially true.
I would say that nobody has the rifles held "tight" in the front rest. They are all allowed to recoil to some extent.
I don't know how to gauge it other than resistance & that is what you'll need to experiment with.
I personally only want the bag to guide the rifle so it only barely touches it. And I mean barely. I like free recoil 99.9% of the time.
Other things you may want to try is the positioning of both a front stop for the fore end & the placement fore & aft with the rear bag. These two things will effect accuracy as well.
Another thing you may try is free recoil vs. applying slight pressure somewhere to the rifle. I use to think just allowing my shoulder to touch the butt made a rifle shoot better. It was still allowed to free recoil, just not as much. I've seen people put their thumb on the back of the trigger guard too. I like it better.
As was said before its all trial & error and what you & the rifle are getting the most consistent results with.
Good Luck,
Keith