That's over inflating; I'm 200 and I have never gone over 120 and hardly ever get pinch flats with 23s. You need to steer around holes/cracks, learn to bunny hop, or simply get your ass off the saddle and let the legs absorb the impact. I know an older more experienced cyclist, who is also heavy, and he rides 23s at even lower pressures because he can effectively avoid pinch flats.

That said, I have been using wide tires lately (28 and 35mm) and I don't see myself going back unless the frame limits me.

tandems with 23s come to mind