Not clear on what you are calling 'stable' - the only advantage regarding stability that comes to my amateur mind is that a full keel is likely to track on course better than a fin keel.
I really don't mean to start an argument with that statement, I have no proof other than what I've read.
Capsize wise regarding stability the rule of thumb is more weight further down is better.
The calculated AVS for my Irwin 38 CC with a design displacement of 20k, and a realistic cruising weight of 24k pounds is in the 130 degree range, either way if I fully turtle I ain't see daylight on the deck again.
That's the same for most boats by the way.
Keep in mind that most folks who are cruising on a full keel boat are not exactly white knuckle thrill seeking adventure junkies - so we are inherently conservative, on a conservative boat. That makes them more stable