askjohnenglish - I have looked at the spam that Akismet missed. They are now marked as spam within Akismet. This means you and others have marked these as spam and it has learned - the same spam should not be getting through.
Please remember how Akismet works - feedback from everyone teaches Akismet and someone has to get the first wave of new spam. The spam that has been caught before was caught because others got it first and you and others benefit from their action in marking it as spam. It seems that this time there is a new wave and unfortunately they chose your blog.
We want to catch spam sooner and have made progress but there will always be short delay. As I said the spammers use Akismet constantly and as soon as they create a spam that gets through they will blast out those spams.
This one month is not something we like to see. I doubt this will continue as the spammers will learn that you do not allow the spam through and it's pointless targeting your blog (yes they do go and check). This is in addition to Akismet learning.
I posted those numbers because when spam gets through the overall numbers really should be considered in the overall context.
The accuracy for your blog is 98.9% which is also important. As I said we would like this to be 100% but this is not a small issue and we are the only line of defence against some big businesses who pay for this to happen.