I don't understand the measurements. Are you saying the clamp is axially 3 inches in length and 2 inches in diameter? (I'm assuming the diameter is adjustable since it's a clamp.)
If the clamp is 3 inches long I think you're not achieving the purpose of a clamp-based
hanger. Because the penis is soft the length of the clamp is not useful up to a certain point (probably 1-1/2 inches). Once the clamp tightens there will be tissue in front of the clamp which is the only tissue you'll actually be applying the undesirable portion of the
weight to. The entire penis will of course be subjected to the desirable portion of the application of
weight.
However, since the leading edge of the clamp is a sharp edge the brunt of the force will be experienced at that edge. This will probably end up being too large a force over too small an area. It will likely become a point where hemosederin and other bruise-related issues will occur. It would be unreasonable to expect such a small area of tissue to be able to adapt to higher and higher
weight.
For example, the Bib has toe-in and toe-out adjustability which allows this edge to be more graceful. This provides a much greater surface area at the "leading edge", in fact it really becomes a "leading area". In other words the Bib can create a funnel effect at the leading edge allowing a larger mass of tissue to experience the brunt force. A larger mass of tissue can also adapt more easily since the trauma is milder overall with the load being spread out.
I can see how the t-band would just slide off at some point. Since the clamp is concentric only a very high amount of radial force would keep it applied. However this exacerbates the leading edge issue. It's a downward spiral of returns. The tighter you clamp it, the worse the effect on the leading edge. Loosening it allows it to slide. The "sweet spot" would be a very accurate combination of tightening the clamp versus the amount of
weight. I would find that to be entirely too much trouble.
This doesn't mean you need to buy a Bib, but I think you should consider the design.
For example, if you could tighten the clamp to form a conical shape you could achieve the same effect as the Bib. You might even consider using a staged clamp which allows for different tightness along the course of the clamp. The loosest end would be the leading edge and the tightest end would be toward your pelvis. With this shape you'll find the clamp will not slip: it would be impossible (unless the
weight was so great it tore off your penis).