Check this out . A poster here turned me on to this and in my experience he's right. At 150 lbs., you can go a lot lower if you choose to. Worth a try before you sell the tires. Read it and do the approximate 60% rear and 40% front for weight and you'd likely be ok at 70 psi. If you, like most of us, do not ride on fresh blacktop and have to deal with some rougher roads then lower pressures can be faster and more comfortable.

https://www.adventurecycling.org/def...SIRX_Heine.pdf