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Well they have all improved considerably. Now all under 1 percent. The vast majority is stales, which I expect from the miners running through MRR proxy, but not the ones mining directly. The only one I have that bothers me now is an s7 on auto diff currently running 3.649k. Should I change the diff or reboot? I'm inclined to see if it improves since it was way above 1% invalid, so I'll defer the call to you as to whether this will help the miner submit faster or I should wait a bit... Note: The straggler is an MRR rig...
Well if it's stales, there's nothing I can do about that.
Especially if it's going via a "non-local to you" proxy - that will only slow it down and thus cause more stales.
One thing to know, non PPS pools in the past have been known to allow stales for a short time after they become stale to make the pool look better.
The side effect of this is two-fold:
1) Pool luck drops
2) No one 'expects' more reward (since it has the same 'expected' effect on everyone at the same ratio they mine)
Changing the diff won't make any difference except possibly at the start where it will randomly be better or worse.
However, if your miner is sending truck loads of diff shares that don't meet the diff requirement, then yeah it may be advisable to reduce your diff.
You wont get better rewards, but you'll see fewer 'Hi' rejects if it is always sending them.
However, the pool will adjust the diff up if you set it too low, no matter what.
P.S. I see no email
. I get it it was about the "other coin". I guess since it doesn't actually hurt the pool just the miners revenue it's ok to sweep that under the rug ehhh. 
