Quite the trek to get back up, but obfuscation made it much easier.
Badder bosses enabled, left the demon spawners alone, the armor was found early so it made the rest pretty easy. Almost died at Yog though had I not had my ankhs
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I'm surprised to hear obfuscation helped on the ascent. I usually have the opposite problem. Not enough enemies spawn on my way to the stairs to turn the amulet back to green, and I end up having to wait around for something to kill.
I almost never take the stairs up when the amulet isn't green. Sometimes I make an exception on the floors just before the boss floors (21, 16, etc) if I need the healing and I'm sick of those enemies.
For me enemies mostly moved around me about 80% of the time and spawned enough to get the amulet to green. The rat king armor definitely helps on a couple levels with ranged enemies that noticed me. It was most likely thanks to the ROA I had too