Sounds like you're using the Resume function. If you wish particular downloads to resume before others, use the search function, it is much more effective & less demanding on the network than the Resume function. Yes I know it sounds like a lot of manual work, lol but it is simply the most effective method.
And don't forget the Get More Results option occasionally since LW only searches a portion of the network, plus people are coming on & offline all the time, so getting more results will both search further and ... hopefully find any new hosts online with the files you are after.