Ninja'd
Well I'll move mine here...what are the odds. 
Yeah I'm not sure how crits are calculated, I assume that the % to crit is straight off the value. And I assume the crit damage is supposed to be "base plus 100%(1+bonus)". But yeah, that's clearly not happening. I guess maybe I was hit for 2k myself, i thought 200 but I have had the animations set high to get enemy armies back on their feet after a ?Titans breath?. This appears to make the damage float faster too.
But it is inconsistent. My pet dog has critted for 4 against an armored prone target (effective armor 9 I think it was) when he normally hits for 1 or 2. I had my archer who hits anywhere from 4-7 or ~14 vs unarmored hit for 200+. And recently had a 27ish attack hit for 700+.
I feel bad since if I crit I let it go, don't feel like redoing a battle. But if they crit, reload. Had an enemy champion wipe out 3 of mine when they crit 3x in a row, one attack and two counters. Was able to check after and see she had a 15 crit chance.