There's a tweak for periodic "high diff" blocks to set the record primes, and I don't know that part of it.
It would be nice to assemble these all, now that you mention it.

Once per week we have a block that has a target of 2hs instead of 2.5mins. So for that block we have a higher difficulty, which was enough to break the record a couple of times. The harder block also has more reward, and for the next blocks after the superblock the reward and target times are a tiny bit smaller than usual. This compensates for the superblock and keeps the average supply and block rates at their originally intended values.
With the new upcoming update I'm hoping to have a new website with all the info put together in a friendlier way.