Hi Milbot,
It sounds to me like you may have some issues with the shared folders, and those should be easy enough to resolve. First of all I am going to assume that you have either recently switched to/been using WinMX version 3.54b4 as this is the one that often users find them selves double sharing files accidentally.
Basically in 3.53 the shared folder didnt auto share 'sub folders' when you select a folder to share in v3.54b4 it has by default 'Share sub folders' ticked, often you dont even notice this tick box at the bottom of the shared file types when you select the folder. The fix is to go in and unshare all of your folders. Then go and re-select the folders you want to share, either 'Untick' this share sub folders box, or remember what folders are inside others so that you dont share them twice.
As for you 700mb files that are not sharing after you have corrected the above problem if they are still not sharing come back and let us know what the files extensions are the .xxx at the end of the files, maybe they are files not shared by WinMX by default.
I hope this will help the que issues as well but to be honest we all have days the ques are smaller then normal and some they are larger.. lets get this other stuff sorted then worry about that.