Alternately, on the next rear tire swap you could go for a 180/55, which is has a sharper profile, is slightly taller than the 190/50 stocker, is lighter, and less expensive. There's no real gain in going with a 190-width tire over a 180 on these bikes. Just my $.02...
Oh, and on the current tire, 37psi is way too low. Based on the manufacturer recommended 42psi for the stock sized tire and the change in surface area of the new tire compared to the old one, 41.3psi will give the same % of the tire as a contact patch. In other words, in order to keep the percentage of the available surface in contact with the ground (thus slightly increasing the size of said tire patch), you need to reduce the pressure by less than a pound.