The air pressure that you have filled to seems really low in my opinion.
I adjust my TraiAir pin box ever trip, do to the changing weight and day time temps. We usually pack different if we are going only for a week vs going for a month so, the trailer weight is different. Also if I am pulling in the mountains the air bag needs to be adjust or if we are pulling in the spring/fall or summer. Ambient temps are different so, the bag and the shock is adjusted to the line on the decal.
Some people have installed an air gage that is permanently attached to the air bag and fill to what the standard pressure that they have recorded. They use that pressure to achieve a good ride with the truck and trailer.
Jim & Jill
Sold: 2010 318SAB Cougar:New: 2016 Cedar Creek 34RL. 2008 Dodge 6.7LCummins the original 6.7L engine, w/68RFE Auto