I`ve tried using printing paper in pinhole cameras but was unhappy with the washed out sky that results from the blue sensitivity of printing papers. I did try using multigrade filters in front of the pinhole but this made little differnce to the image. With the sun shining directly at the pinhloe I managed to record a superb image of defects on the surface of the filter but nothing else.
I did find that Kentmere papers required much shorter exposure times than Ilfords.
I eventually gave up on printing paper and bought a 5x4 developing tank and started using film instead with much better results.