"PrintDraft" was basically a slimmed down, non-configurable version of PTXprint. It's also been removed from Paratext for a while, which makes one wonder what version of Paratext you're on.
There might be a way to do what you want inside of PrintDraft, but it's likely the real solution is to either:
1) Use PTXprint which, while a little complicated to set up, is much more configurable, or
2) Use \ms# markers rather than \mt# ones
Logically #2 makes sense to me--why would you consider weekly divisions the title to an entire "book" rather than major section divisions?