If you want base girth, hanging is a good way of obtaining it. You should surely see results after 100 hanging hours.
If you are interested in overall girth I have some exercises to propose, but your unit should be very conditioned before trying those. I am not responsible for any thrombosed veins that will occur if you do those exercises without a unit being really tolerant to clamping. So, do those only if you consider your unit to be really clamping-tolerant.
I do horse440’s while clamped. Making sure that they last at least 30-45 seconds.
Clamped, 110% erection, and I gently start to squeeze the glans. Trying to empty all the blood from it and make it flow back to the lower penis. It should take from 30-60 seconds for each squeeze. I then get back to 110% erection and do another one. Do no more than 10 of those in a clamp session ,it gets really intensive afterwards. I noticed a base girth increase by those too.
Sometimes, I mix those with semi-erect clamped bends.
Starting from 110% erection like before, you start doing the horse440 and at the moment that you have no blood left in the head -that is at the end of the repetition- you are standing with a 70-80% erect penis. Then slowly bend your penis against your curve.Bend it really slow, feeling the tension and being ready to stop if you feel anything awkward or get unusual pain. If you have a downwards curve, tilt it upwards, if you have a left, tilt it right etc. If it is straight, try from every angle. If you are angled, 80% of the bends should be against your curvature.
With this way you are hitting the under developed tissues of your unit. It is obvious that if a penis has an upwards curve and you measure it from both top and bottom, the top side is shorter, having less developed tissue. When you are bending it against that curve, you apply more pressure to the shorter tissue. You should do those bends near midshaft, or near where the center of the curve is. If you do them near or at the base you should have improvement.
Keep in mind that these are extremely intensive exercises only for advanced and experienced clampers. No beginner should try those, not even a veteran that is not clamping at this period. You have to be really accustomed with clamping to try those.
I guarantee your results if you try them. Good luck