OK I killed the sumbitch. The source of my frustration was, I have deduced, external: when
radiotelescope, who has gotten through about half the game, was giving me advice on how to beat this particular guy, his understanding of how to get a necessary prerequisite event to happen was a little off-kilter. (Or maybe he was giving me obscure advice on purpose, hmmgrumble.) The result was that I have been spending minutes running back and forth trying to trigger this event and getting no results... actually, even worse, getting occasional accidental results.
I finally figured out the correct trigger, and even though I fell off a couple more times I still sliced 'im up in short order.
So I no longer hate the game, at the moment. But I maintain that it's friggin' hard.