Hanging 101: Don't Mix This Length Routine With Any Girth Routines
frb3: if you've been hanging a year, then clearly you have a substantial amount of experience, and you can make decisions based on that. This guide is written for beginning hangers, it's only hanging 101. However, no hanger, no matter how advanced should ever mix girth work with length work. It's just not common sense, since girth work can cause losses in length and it's very intense. Combining two very contradictory, very intense exercises is just not safe!
Advanced Girth Work + Hanging = Nonsense (& Potential Injuries)
It has been demonstrated that those who have done heavy girth work (horse440's, clamping, ulis, etc) tend to have trouble making length gains. The long term conditioning from the girth work makes the penis incredibly tough, and very difficult to deform with normal length work. This is why you'll usually get the advice "length first, girth second".
This is also why I said not to mix hanging with other routines; hanging is very intense, and significantly weakens your tunica, ligaments, etc. Something that might make sense with a manual routine could be very dangerous with hanging. I don't want people to get injured, so my blanket advice is to play it safe. Jelqing with a high erection is girth work, while jelqing downward, with very slight erection (the opposite end of the spectrum) is length work. Although jelqs are not hardcore girth work, I think your own experience indicates that hanging + jelqing is too much force for your penis to handle.
I don't know your medical situation, but the bruising (injury) implies that Jelqs + Hanging = Too much.
20lbs is a lot of force and the attachment point stress on your penis shouldn't be underestimated. Those tissues get fatigued with hanging, making them vulnerable to injury. Those forces combined with jelqing are very hard on your penis. You can do research and come to your own conclusions, and in the end what you do is your choice. At least based on my experience, and based on what I know, I just can't advocate mixing hanging with another routine (like clamping), hanging erect, or doing anything else which might cause an injury.
Don't Let it Turtle: Golf Swing Weights
A lot of experienced hangers do use golf weights to prevent turtling. Someone that has just started hanging is probably trying to figure out what fatigue is, and is going through a lot of skin stretching, and adapting to attachment point stresses. They are already going to be sore, so adding anything extra is not advisable. That's why I didn't mention this in "Hanging 101". If you do try this out, you may want to do it during a week where you have not increased your hang time, or your hanging weight.
Adding a light ADS, like golf swing weights could be helpful, since this would encourage your penis to heal in a more elongated state. 3x Golf Swing Weights only weigh about 1lb, so they wont do much at all to an experienced hanger that has adjusted to long periods of hanging with a lot of weight. Of course, the rule still applies that if you feel any pain at all, you should reduce the weight, or remove it completely if necessary (common sense always applies!).
With Golf Swing Weights, you need to make sure to wrap as lightly as possible (without allowing slippage), and it's important to leave the glans uncovered so you can monitor things and assure you're not losing circulation (cold glans, bluish glans, purplish glans etc can imply circulation issues). It's best to check every 20 minutes to make sure you don't lose circulation with any ADS / Extender device.
Advice to Frb3: I'm Trying to Give Something Constructive
I don't know your complete situation, so it is hard for me to advise you. As I said before, the jelqs + hanging appear to be causing the damage (bruising). I don't want to leave you with nothing, so I'll give you something constructive (not just criticism). You could experiment with an extender to increase the intensity of your length work (if time is an issue and you can't hang at least 10 hours per week).
Hanging + an Extender?
Edit: this is a bad idea. Don't even try this; we have seen at least one nasty injury from this kind of experimentation.
Edit: If you try an extender + hanging proceed you will probably break your penis. I warned you!