The danger of putting too much weight on the latest block:
Lets put it to an extreme and you use only the last 1 or 2 blocks. A pool can easy cherry pick those blocks, leave for 2 blocks, come back... and repeat. The diff would jump up and down like crazy.
So it is important to fine tune the settings and find a good path between instant reaction and smoothing the diff changes.
I would never recommend a 1-2 block focus. That would be crazypants thinking.
I seriously think 6 is a nice even number, and it falls in line with about the average number of blocks that Clever rapes at any given time. You put more focus on those 6 blocks, instead of 24 evenly, and you'll see a big change in Clever's ability to own 90% of the network.
Of course, GJ has some code on the table right now. I guess we'll all just need to wait to see what it looks like before we try to push one way or another.
-Fuse