I want to stop hitting the ball thin

SwingWeight:

Increase by at least 3 points if swingweight is believed
too light for the player.

Shaft weight/total weight:

Increase shaft weight/total weight only after trying to
increase the swingweight with the lighter total weight.

Vertical roll:

Decrease radius (to be more flat) by at least 4 inches so
bottom of face has more loft.

Length:

Increase by 1" in the woods and 1/2 inch in the irons
only if the player is very crouched over the ball in the
address position.

Hosel offset:

Increase the offset in the irons by at least 4-5mm and
the woods by at least 20mm (changing from a
traditional face progression to an offset hosel)