If you ask Bib, he will say (verbatim): "Anything that deforms and stresses the lateral layers of the tunica should not be done while hanging". This would include pumping, clamping, manual girth work, hard jelqing at high EQ, PGE1 injections and anything else you can think of that gives you a girth pump.
Here's a link explaining why:
http://www.pegym.com/forums/pe-theory-science-forum/16295-length-first-girth-second.html
I abandoned girth work and my two pumps to hang. Not only does girth work while hanging cause attachment point discomfort, even more seriously, it:
1. Toughens the tunica, making it harder to gain from higher angles (tunica stretch) in the future
2. A thicker tunica is harder to deform, according to logic. Analogy - a thick rubber band is harder to stretch than a thin one.
If you just care about ligament stretch gains and don't plan to hang at higher angles for gains in the future, then pump away if you want to work length and girth. Working girth does not affect ligament gains - just attachment point discomfort.
Getting back to the body fat % thing:
I have the data in front of me from stepping on the body fat % scale at my gym.
Oct 2012 - I was:
16.9% body fat
181.81lbs
30.81lbs of fat
Jan 31, 2013:
14.3% body fat
166.0lbs
23.81lbs of fat
That means I lost 15.81lbs of weight, 7lbs of that being body fat. That's pretty much 50% of the weight I lost being fat. That's not bad for an amateur. How did I do it? Eating less and eating the stuff they told me to in those links I gave you earlier. Lots of water, omega (fish oil) pills, avoiding carbs at night, avoiding foods with manually added sugars, processed ingredients and high fat dairy. Lean meats, raw vegetables and fruits, nuts, canola oil for cooking, virgin olive oil for dressings etc.