Orly!!! I never knew that! So stick with the one I have then I guess. Thanks . Although looking at the patch notes, it says it is now 1% DOWN from 5%.....that doesn't sound like a tooltip error being fixed to me. Can anyone else confirm?
Has always been 1% to my knowledge as well. The tooltip has just been misleading since release. A lot of meta gems have had issues, in fact, and is a reason why they are fixing and changing quite a few of them.
As far as i know, it's 5% increase of base value, landing at 31.5% as of now really, tooltip just want to show it as 31%.
It's probably a tooltip change so that it gets less confusing, the question "why do i get 31% instead of 35% blocked damage?" is perhaps very frequent at bugforums and bugreports.