Looks like you are doing everything right.
As I often do in cases like this one, I can suggest sending you a special build of MF Pro which can help reveal the reason why the data are not being passed to the Excel sheet. This build will write own important log information at every step of the communication between MF Pro and Excel. I will then ask you to kindly send me the log so I could work out the root of the problem.
If you're willing to cooperate in this manner, please let me know, I'll send you the build.