There has been a good bit of "expert" advice leaning toward heavy'er riders lowering the PSI a bit. I'm 210 at 6'1'' and a couple of years ago quit using 120 PSI in 23's lowering it to 100, seems to give a more comfortable less compliant ride, hell I'm not racing so it works for me. If you want to know more of what the so called experts at roadbikerider.com say about the subject you got to give them money for a subscription to their site, no thanks the guy at my LBS knows just a much as "uncle al" at RBR and he will share it for free. However if I wanted advice on doing a 200K brevet I may want to pay for it from Ed Pavelka who is a legend at those types of events..........................
That's fine and good, but you run a much higher risk of pinch flats if you go too low for your weight.
Then again, my OCLV Trek combined with 105 in the front tire and 110 in the rear tire rides great. I've run my front tire at 80-85 psi before (got a flat on the road and used a hand pump - checked the psi when I got home after doing intervals), and while I was still able to ride the same speeds for the most part, it was too soft. And I weigh 50 pounds less than you.