Your oil pressure readings are fine. Completely normal for an engine with some miles. I do not think you need to change the pump at all. Yes, a new pump may get you a bit more pressure, but that will not help your engine. The pressure you have right now is more than adequate.
If you are using it for heavy duty use, like towing, consider a thicker oil in the summer. If you are using 5W-30, consider using 10W-30.
If you already use 10W-30, consider 10W-40 in the summer.