I have done about a half dozen hanging cycles in my time. Each one lasting 1 to 3 months, and averaging 2 to 2 hours in the hanger for those months. But I haven’t done a serious hanging cycle since last year as my length is now good enough. I may do a few more cycles so that I cement in around 7.5 eventually.
Anyway, I use BIB hardcore hanger, modified for an extreme toe-out and open bottom configuration. There are instructions for this in xenolith’s posts in the “hang without wrap?” thread and in his progress report. That configuration, with no wrap, allows for better circulation. I attach it as close to my base as possible, rather than near the glans. I have experimented with near-glans attachment points, both with the BIB and with a self-made clamp based hanger. I have found that all compression hangers attached near the glans are rather uncomfortable, and can even cause lasting discomfort in that area.
Vacuum-style hangers on the other hand, are able to attach near the glans safely, as are extenders (I have no personal experience with extenders though).
A near glans attachment point will stretch more of the shaft, and tend to pull on the CS relatively more. Whereas a dorsal near base attachment will stretch only that portion of the shaft proximal to the hanger, and will pull more on the CC’s and ligaments.
I’ve had success by mixing these approaches, using the glans attachment of a vacuum hanger to do upward angle hanging (upward angle extender would be a good substitute) pulling on the full shaft and the CS. And alternating that with using the modified BIB hardcore attached near the base (or other compression hanger) to do downward angle hanging, working the CC’s and ligaments.
Sliding while hanging downward angles with compression hanger generally means the hanger is not tight enough. Although as I mentioned, some sliding is unavoidable - you do want the sliding to be limited, and for the hanger to “catch” on the internals somewhere in the midshaft area (at least 1 inch of shaft should be left before the glans after it catches and stops, perhaps that’s what the instruction was indicating). It can take a while to find a technique and hanger configuration where it is tight enough to stop the sliding, but loose enough in the right places to allow decent circulation. This is generally a personal process of trial and error, but I would point you again toward xenolith’s tips on improving circulation while hanging, the extreme toe out, no wrap, tight top (dorsal) closure, and open ventral configuration.
Good luck, and remember the constant heat.