Well, I just tried to derank myself with the basic strategy of the Warlord glitch.
I was rank 19 with all diamonds set.
I was finally able to get rank 18.
Now you would think that the game reacts to this in some way, mainly because with rank 18 you would only have 17 diamonds and therefore couldn't upgrade all classes.
And guess what ?
I still have all diamonds set with -1 available diamonds -.-
I don't know what to do, seriously.
There are just 3 ways to go:
1. Gaining 1.3 million XP with regular boosting
2. Dropping 200k XP by team killing
3. Hoping that the server screws up and resets my diamonds
To be honest, I don't know what of those 3 options would be the fastest one...