I wouldn't worry too much about avoidance for tanking raid bosses. Armor and stam are almost always superior.
- Wrong meta. Get the armor one.
- Get the +30 stam to shoulders.
- Shield of Righteousness glyph is completely unnecessary, it saves very little mana and, even if it were effective, Paladins tanks rarely if ever have mana issues in a raid setting, even with 1/2 SA. Ditch it for the SoV glyph - 10 expertise is a huge chunk of threat.
- Armsman to gloves is probably unnecessary for you. I would replace it with +18 stam or +240 armor for the extra EH.