The thing about a set of ZEROs is that they can allow you more flexibility.
For example you could run the amp straight into the mid/tweeter section while using the ZEROs for the bass section (assuming that the speaker is bi-wirable).
OTOH you're not going to hurt the amp trying different taps so I would do so. But it does seem as if the 4ohm tap is likely the most appropriate. At any rate, keep your speaker cables short (under 3 feet is a good idea) and make sure the speaker connections are tight.
For example you could run the amp straight into the mid/tweeter section while using the ZEROs for the bass section (assuming that the speaker is bi-wirable).
OTOH you're not going to hurt the amp trying different taps so I would do so. But it does seem as if the 4ohm tap is likely the most appropriate. At any rate, keep your speaker cables short (under 3 feet is a good idea) and make sure the speaker connections are tight.