I feel doing content with PuGs is acceptable with the following caveats:
  1. You're not hindering the group from collecting their loot by reducing the chest pool
  2. I would inform your static of that intent and see their response

I personally don't mind my static members to go out and clear content after our raid week is over but I know some players may find that offensive. Yes, it technically doesn't affect them since you're already doing it past your raid nights but some players take pride in clearing content together as a group for their first time and I would gauge your actions around those nuances of your group.