My MYP and another member on this forum have both experienced a bit firmer ride after a few thousand miles on our MYPs. The dampers seem to be best when brand new, then drop off in ride quality. I rode in a friend's brand new MYP and also noticed that it was a bit smoother with only a few hundred on the odometer.
My own assumption was that it would improve over time as well, but it seems the opposite has been the case. 38psi in the tires is a good recommendation though.
Ride quality also improved after Spring arrived. When it was super cold, like 5F, ride quality was abysmal for me.