If you want those days off and that's the most important thing.

Do it like this:


Prefer off X,x,x else start next
award xyz
award xyz
award xyz
Start Reserve
Prefer off X,x,x else start next
Prefer off Y,x,x
Start Pairings
Prefer off X,x,x
award xyz
award xyzzy

The reason I put the Prefer off X,x,x on (italicized) the third group is that PBS will try and get as many off as it can, so at least it's getting some of them.