I believe 'iacas', a golf instructor, maintains that grip size is mostly comfort only and does not in itself lead to mis-hits, etc.
Personally, I bought 2 of those super jumbo size Bryson grips and put one on my 7 wood. Taking a long time for me to feel normal with it. I guess I thought using that grip would lead to some kind of betterment, perhaps so, but it is comfortable.
And, if interested in testing various grip thicknesses, I recommend shopping at the tennis store for grip wraps. Badminton works well too. I see many styles and colors and only $2.0 each. Simply wrap over the grip that's on the club, maybe secure the two ends a bit better and away you go. Gives a good feeling and the underlying grip is not affected if your hands are unhappy. Easy to remove and no residue.