AMR doesn't want 4 piece tier for resto shaman setup

Snapshot ID: 51e36c6f2cdf4ad2a944c18263a90f8a

I just got 4 piece tier today on my shaman. My enhancement setup, which is primary, recommends I put it on, as expected. My resto setup doesn’t bother and optimizes with 3 pieces instead of 4. But when I click on the legs to see more details it shows the tier legs as a 2.32% improvement over the legs it wants me to put on.

Any ideas? Thanks in advance!