In RTA (Random Tactical Arena) and TE (Tournament Edition), typical armies are 10 times smaller than yours. A typical SpellPower for a warlock is around 20, with 30 considered a very good spread (in TE it's higher, reaching up to 40). This means that Chaos magic works at least three times better than in the 6th month of the game :)
I will give an example of multiplayer mods, which are actively conducted tournaments.
The RTA (Random Tactical Arena) and TE (Tournament Edition) typical army is 10 times less than you show. Typical SpellPower warlock is 20, 30 is considered very good (in TE it is higher and reaches up to 40). This means that the destructive magic works at least three times better than in the 6 month game :)