Where did you get this number? The recommended PSI for the tires should be on a sticker on the driver side door well that you can read with the door open. The PSI rating you see on the sidewalk of the tire is the MAXIMUM PSI that the tire can safely be inflated to without risking catastrophic failure.Tire pressure was checked @ 50 psi, recommended.
If you are driving around with your tires pumped up to 50 PSI that would explain the crazy behavior. Figure out what your tires are supposed to be set for according to the manufacturer recommendations on the sticker (and also in the owners manual). I’m general that will be around 32PSI for the Foresters, depending on model and year. Going +/- 2 PSI according to your preferences is OK, but DO NOT look at the sidewall of the tire, that is not where to find the correct value.
Be safe out there!