I ride a gravel bike and decided to upgrade my rear tire to a new semi-slick one so I can be a bit faster (Innova Pro Stampede -> Maxxis Receptor). The problem is though that the Maxxis Receptor has a recommended PSI range of 35 to 60 PSI while the front tire (Innova Pro Stampede) has a recommended PSI range of 50 to 75 PSI. I've heard that your front and rear tire pressures should be roughly equal with just a bit more PSI in the rear tire. I've tried using around 50-55 PSI for both of them and it feels a bit too stiff in the rear for the kind of roads I've been going through (ex. worn pavement/gravel). Any advice?
Both of the tires are 700x40c and I weigh around 63kgs/138lbs and the bike weighs around 11kgs/24lbs.