MS Rewrite rewrite

I've been struggling with detailed rewrite of my longtime (I've been working on it for more than a decade) SF novel Dead Heroes. I knew the MS was too long. Nearly 137.000 words. My gut feelings were confirmed by Peter Watts' preface in his SF book Behemoth. He says, "...books by midlist authors will not receive wide distribution if they [the book] cost too much--that is, if they weigh in at more