So for Munitions Failsafe to activate, do both Cluster missiles have to miss, just the second, or either?

For Munitions Failsafe to activate, you need to miss with both shots.

See FAQ entry for Cluster Missiles:

If a ship is equipped with Cluster Missiles and Munitions Failsafe, both attacks must miss for Munitions Failsafe to activate.

Yes - both have to miss

FAQ page 14

https://images-cdn.fantasyflightgames.com/filer_public/e3/21/e32124fe-bb23-406c-b081-0ff20b074f18/x-wing-faq-low-res.pdf

And with the photo finish it's Klutz by a nose.

And with the photo finish it's Klutz by a nose.

The law of conservation of Ninjitsu does not apply here it seems

:ph34r: :ph34r: :ph34r: