Stringing and Print Density Test

Hello all, I've created a test for my printer to check the retraction to be used and if the density of the wall in the bigger cylinder was ok... this is a 30x36mm and 26mm height print the stringing towers are 25mm tall and 5mm of diameter... the big cylinder is 25mm tall and 20mm of diameter with a wall 1mm thick.
to begin I made 3 files in Cura (you can do it with your slicer) with the same parameters of retraction speed (50mm/S) but changing only the retractions distance: 1mm, 5mm and none.