Writing like Hunter S. Thompson is not something you learn, it's something you let out.
Most people can learn to sing well enough so they don't annoy the congregation, but most people will never develop a voice as distinctive and recognizable as Joe Cocker, much less develop that exact voice.
Most people can learn to write well enough to communicate clearly, maybe even enjoyably, but most people will never develop a writing style as recognizable and ground breaking as Hunter S. Thompson, and any attempt to mimic Thompson (beyond college creative writing classes) would be annoying and embarrassing.
EDIT: I do not mean to say that the post author's writing is annoying. My comments are only related to the idea of learning to write like HST. Some day I hope to learn to write well enough to communicate clearly.