I was bored while foraging for clockwork grease in PoI, so I pulled out my Steadfast Servants in turn for my 110 Druid, 91 Ranger, and 115 Ranger all on separate accounts and grouped (also completely unbuffed except for a mount buff on one of them and perfected camo). One thing worked as expected: The SS from the lower level ranger conned at lvl 91, so it cast lower level buffs. (Servant's Armor XI, Haste VI, and Clarity IX) The 110 Druid's servant cast Servant's Armor XIV, Haste VI, and Clarity XII, but so did the 115 Ranger's servant. Servant's Haste VI is 70% haste, so that is fine as the maximum, but I would have expected the other buffs to have improved with the increase in level cap. (Did Armor and Clarity get a new rank from RoS raising the cap to 110? I don't know.) I also did not do any fighting, so I did not test what Servant's Elixir each would cast. But the thing that caught my eye the most, and what had driven me to test this at all, was that none of the servants cast Servant's Haste on my 110 Druid or 115 Ranger. I guess the issue is that it seems that the Steadfast Servants were not updated when level caps went up either with ToV or RoS. Or, they were updated incorrectly.