My current BiB has me giving up 6 overall ilvls, seems pretty radical. So I looked into the stat weights and while I think understand where you are going with this (my suggested BiB gear lose me lvls but does come closer to that the charts says is best in my secondary stats), it appears this does NOT take into account my Spell Power (Intellect). It has me essentailly losing almost 3K spell power… doesn’t really seem right.
I moved your question to its own topic under the character specific - gear category that we use for helping people with specific questions about their characters.
If you can provide the latest addon export for your character, we can see what you are seeing and take a closer look at the results.