I won't use 8300 for manual sheet loading printing, if you do a lot of that. You have to feed it one by one, by opening the lever, open the top, feed the paper, manually align it to the line, put the lever down, put the cover on, select the type of the paper for each. The workflow is optimized for roll printing and not sheet printing.
Also as you noted the margin is rather large especially the trailing edge, so for image like 8x10, actual printed image is way smaller.