I use exactly what it says on the drivers side door jam 35 psi all around.
I have 19" wheels

 

35 psi all around here - stock 17's.

 

Tire expert told me (on my XK) that the Jag specification (35psi) was too low for the tires and would causepremature wear. He said that 40psi would be more normal for the tires. He said Jag specify 35psi because it leads to a slightly softer ride on low profile tires. (I have 20" wheels)