I want to hit the ball lower...

Loft:

At least 2 degrees less for all swing speed players in
the woods, irons and at least 1 - 1.5 degree less in the
wedges.

Clubhead design:

Center of Gravity
At least 3-4mm higher and 4-5mm closer to the face in
the woods and at least 2-3mm higher and 2-3mm closer
to the face in the irons.

Weight Distribution:

Narrow sole, shorter sole length, normal to mid-size toe
height in middle and short irons, taller in the long irons
(keeps CG from falling back from the face).

Shaft flex:

More stiff, RSSR equal to or up to 10mph higher than
swing speed of the player (Distance could be at risk
though).

Shaft bend point:

Higher

Hosel offset:

At least 4-5mm less in the irons and at least 20mm less
in the woods.

Vertical roll:

Less on the top of the face (straighter) and (more
rounded) on the bottom of the face.