Leave the image size and the sourcerect alone. The problem is the zonerect. Seems like you modified the map dimension in photoshop and the spreadsheet can'T know that of course. However, it can be calculated manually from two ingame /locs (ideally as far as you get to e.g. the top left and bottom right corners of the map) and their respective pixel locations on your map image. For this you can use, for example,
this tool.
If you care about the theory, see
here.