You should not look at only one block to make any definitive conclusion (as to whether the miners are actually doing everything they can). I can just as well say that some miners are doing the best what they can while the rest of them (which are in majority, by the way) are doing essentially nothing. In short, it is only around 144 new blocks found daily, so could anyone post exact data as to the actual sizes of the blocks mined for the last two days (or since when the jam has started)?

That would most likely close this question