Hi! I am in the process of reprinting some of my covers using A4 paper, but I wanted to do some test prints before doing so, using both borderless printing and not borderless printing options. I am printing with a Canon TS5120 on Photoshop CC 2020. When using borderless printing, I notice the cover fits quite well, but looks smaller than what it's supposed to be, with parts of the case still visible in the front, back, and spine. When I print without using borderless printing, the cover fits the case (although oversized) and has ripples even after I fixed the slight imperfections of my cuts. (Reference photos are provided) The cover in question is a retail cover from Pokemon Sapphire, which I checked in Photoshop to have perfect 300 DPI and the 10.867 x 4.567 size. Is this an issue with my printer, Photoshop, or something else? I don't want to print the colored cover until I know I can get it perfect of course. One thing I want to note before hand is that I do have experience with Photoshop, but not with printing extremely accurately.
(Had to upload to imgur because of forum issues. I can provide higher quality photos if necessary)
https://imgur.com/a/ncgL1H9