I do not know the engineering data for ti and would also love to see it but I have to believe volvo did it for a reason so I am sticking with the staggered design.Yeah I would love to see the engineering data that drove the staggered tires of such subtle difference and drove just 1psi difference front to back. They have to realize the average buyer will never follow that. Heck when I go to get tires balanced I tell them to stay way from touching pressure as they just usually do 32-35 all around.
Rather spend more and in an emergency have the car respond as intended or if something bad happens wonder if the tires made a difference.
I replace my tires regularly. Keep them symmetric wear left and right. The tires are where the car hits the road.
Just my opinions