Confused,
It is hard to give advice when there is no video or some kind of information as to how you release the ball. If you are trying to hook the ball by twisting your wrist counterclockwise your wrist will soon feel the strain. You would need to learn how to put revs on the ball using your entire arm, not just your wrist.
I recommend that you continue to use the
wrist support if only to prevent injury to your wrist since you seem to be hurting without it.
Since your revs are down when using the
wrist support I suspect that you are turning your hand prematurely while consciously trying to put revs on the ball.
Picture the ball as the face of a clock with 12 oclock pointing towards the pins and 6 o'clock pointing directly behind you. While in your stance position your hand so your middle/ring fingers are at 5 o'clock. Position the ball in line with the joint of your shoulder. During your approach keep the inside of your elbow facing the pins at all times, even when you release the ball. When releasing the ball picture in your mind an image of "driving" your hand through the ball from the 5 o'clock position to 1 o'clock and beyond. Do this and you will be not turning the ball prematurely resulting in low revs.
There are exercises to strengthen your wrists. One exercise involves taking a short length of broomstick (15 inches or so) and tying a rope (1/8 inch diameter nylon) about 4 ft long tied to a 5 lb weight. Extend the stick in front of you and roll up the weight until it reaches the stick. Reverse the process letting the weight return slowly to the ground. See how many reps you can do.