I think it has something to do with the Varidef.
At another very large scrypt pool I used to run LTC I have noticed that my diff never goes higher than 700 and then all my miners runs max out around 42-44 Mhash pr machine.
But when running LTCD my miners run on avrage 37-39 Mhash, so I think varideff kills a lot of hash.
I could be nice if best pool hat different ports for different diffs like : 700, 1024,2048 and so on.
Vardiff shouldn't be a problem. But it depends on hashrate. If you have large hashrate or large rented rigs on single worker, vardiff should start with much higher value.
That's why we've opened 2 ports on each of our scrypt stratums High (>512) and Low VarDiff.
The correct hashrate is what you see at your miner side. Pool calculates average hashrate based on submitted shares in last minute, which is not always accurate
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)
Strange, since how come i have almost no HW errors at Coinotron with diff 700 and Max Hash and when running at Best I get lots of HW errors and lower Hash. Miners are Zeus Lightnings running with PI´s, so same config for both pools ?
I was down to 23 percent valid and changed to the 3315 and now back at 100 percent.
![Grin](https://bitcointalk.org/Smileys/default/grin.gif)
but could be slow updating and I might not of had to change in the first place lol .