That is an interesting conclusion. I am running for little over a month now and if i look at the block find over that period it is now at about 115%. If i look at the biggest pools like csc.hash.so and csc.dedicatedpool.com they are too high as well. So you are right in that in general it is too high and should be lower. How do solominers perform? Do you guys have high percentages as well? In that case, what could be wrong with the network? I can imagine that if one pool gets too big (50% or more) that it will hurt other pools as well moving all miners in the end to one pool which is NOT good. So i stay with my previous suggestion, either all big miners (hash power of 5MHash or more) do solo mining or they spread out their hashpower over all available pools to flatten out block find percentages and make the network more stable.
Hi!
csc.hash.so was my first pool, so I have been extensively looking at the block find rates and trying to improve things. Currently we have 106.99% for the past 24 hours, and adjusting for orphans it rises to 110.5%, which isn't great, but I think overall it's probably close to the maximum even for solo miners. Obviously solo mining is a little bit more efficient do to the fact that you cut the miner->pool latency, that's why it is important to connect to the closest stratum server there is (if the pool offers multiple servers to choose from).
As for the efficiency, I have seen a cycle that repeats:
* Difficulty rises
* Miners move from CSC to more profitable coins
* difficulty drops, and coin becomes more profitable again
* Crazy amount of miners move over to CSC
* Block time drops to 15-20 seconds, orphans increase and efficiency drops.
* Diff retarget takes a while (720 blocks) and during that time everyone will have a bad time

* Diff rises, and block time rises to 40-45 seconds, because miners move away to different coins.
The 50% thing doesn't help, or break things in regards of efficiency, but it's important that no single pool holds more than 50% of the hashing power. My pool comes close to this at some times, but normally it only has about 30-35%