Try rolling with different size cylinders, from a larger diameter than needed to a smaller diameter than needed.
Start with one that is larger than the final diameter. This gives the paper a bit of curve memory and sort of relaxes the fibers.
Continue with smaller diameter cylinders with successive smaller diameters. This increases the memory and relaxes the fibers more. It also helps reduce the wrinkling of the paper that can happen sometimes when trying to roll to the final diameter of the part in one step.
Finish with a cylinder that has a smaller diameter than needed. This will allow for spring back of the paper.
When glueing try to find a cylinder that is the same or close to the inside diameter of the part. Insert the cylinder into the part and use it as a backer to support the glue joint and to help burnish the joint to flatten.
Where to get the cylinders to do all of that rolling? Well, look around and start collecting cylinders. Soon will have a nice collections of cylinders made of wood, steel, plastic, glass, composite, or whatever material is used to make cylinders, in many diameters and lengths. Broom stick handles, plastic plumbing pipe in various diameters, wooden dowels in various diameters, a telescoping car antenna, etc. Them cylinder things are all over the place once you start looking.
I have a set of wood dapping punches in around 24 different diameters. There is also a collection of wood, steel, and plastic cylinders. Even the Aleene's glue bottles come in handy sometimes.