I don't really see where the problem is actually. You have short, mid-long, and long cables. They are all the same. So I use the shortest ones for the pads that are close to the module, and long for the farthest ones.
For example, I plug cable 1 in tom 3 in the module, then the other extremity in the pad I will use as tom 3. You can not be mistaken if you plug cables one after another.