Just to be clear I think this is really a good sign for Lester...one because as I have stated I think he is working really hard at maintaining consistent mechanics and having found a way to do that in the middle of the season. I think he really has to concentrate very hard while on the mound to maintain consistent, repeatable mechanics at this point...more than he probably would like to. Two, it does suggest he can resolve the mechanics issue completely given enough time to work through it, likely an off season.
While he has had less issues to go ballistic over lately, at one point he seemed to be going ballistic over one bad ump call. So, it does look like he is making progress there as well.