I got the two-toned tan look two when I first started doing the hose clamps. That look has gone away, largely I believe because of pumping, which I supplement with this exercise.
I also find that I soften up a minute or two after I fully apply the clamp. I think in part this is due to a lessening erection but I also think it is brought on by the tissues expanding from the increased pressure.
Another technique I’ve added, expecially after I’ve “softened” after having applied the clamp is using a croakie (one of those neoprene rubber attachments that you put on the back of sunglasses to keep them from sliding off your head) as a tourniquet (just in front of the clamp toward the glans usually but I’ve also tried behind the clamp). The croakie will give an aid to the clamp in upping the pressure that is better and less tiring than if you were to use your hand but is more flexible and easier to apply than an additional clamp.
I can tell you that the addition of the wrapped croakie really ramps the pressure up and I’m only able to take about 2 minutes of it. The old tally gets quite dark and angry. Best of all it gets quite thick, then combined with some pump sessions (the pump sessions are separate. I’m not quite crazy enough to try to integrate the two.) and I feel good girth gains are on the way!