Sorry for the short reply - very limited on time today with the coming up patch.
As far as our balancing changes - we never make them without a lot of consideration, and we base it on both player feedback and our own experience - as you might have noticed most of our developers, and mods spend many hours in game easy day.
With this specific Ogre changes - we had to address 3 issues:
-Ogres are really easy to acquire and leveled up - due to are of effect damage
-Level 20 Ogres became unstoppable - I could solo most NPC towns with 30 Level 20 Ogres without need of any other unit.
-We had A LOT of player feedback on this in-game with understandable complaints from PvP
And FYI here`s the list of changes, yes it is a big change, but in our tests it works rather well. If not - we can always tweak it in the next patch.
HitPoints = 15000
Attack = 440
Strength = 10
HitPoints = 9500
Attack = 230
Strength = 8