I'm also 240 lbs and I run 100 front and rear (700x23). Lots of cracks in the roads here, more pressure than that and the ride can be pretty ruff. For gravel bike paths (rail to trail kind of thing and 700x25) I run 95 front and rear.

Long ago, I recall a team mate chick asking why her bike was so skittish around corners at speed even though she was riding sewup tires. We asked here how much pressure she ran ... "Oh, usually around 170 lbs". Ohhhhhhhh ......

jw