Way too many graphs but take it as a good thing. People may see it in their on way and may be understand from a graph that really suits them the most. I do like the first one which is the before and after.
Good stats really.
I think the decrease of 36% from before is not a problem and I think that it is instead an improvement. The fact that your stats say that given merits are less means that merit abusers were lessen. We have noticed before that some users send 50 merits to a nonsense post and I think some of them are now very careful in sending their sMerits which is a good thing. They are somehow forced to find a bit of quality in a post.
Your efforts are appreciated. Keep up the good work.