I think his best stuff was almost thirty years ago, although I do remember reading a great editorial about Ed Meese in the PI in 1988. HST was so spot on, the PI never carried him again. He was the perfect carrier of the anger that many of us feel towards the political system.
I have also read one or two biographies of HST, and saddly, he seemed to be a drunken shell of himself, a caricature of his past. There were pretty clear alligations of domestic violence, and his literary skills had diminished.
I think alot of the talk of his comingling drugs and writing early in his career was just hyperbole, his writing was too clear to come out of 30 hits of acid, but he eventually started acting out his own false personna.