Haven't been in your situation, but as best I can recollect the Red line of Justice covers the actual days of vacation, and not any Expanded days.

In your situation, might slide a day to the right. But, have to make sure your vacation block is touching your any scheduled trips you'd like to block. No limit to the number of CHs you can knock out by touching, only get scheduled vacation hours + 6 for an expansion

If you wind up with a VTO or RSV line, there's a 48 hour buffer on either side