I am confused as to how luck works in all of this....
Is 100% good? Is lower % better? Or is higher % better?
Is luck and Diff % relational?
I'm having a hard time understanding the luck part in all of this. Red is bad, green is good...but luck varies..
Are we trying to be at 100% luck all the time?
https://imgur.com/a/515j6Thanks!
Expected luck is 100% and if we hit that on every block all is good in the BTC world. Better luck is less than 100% and worse luck is greater than 100%.
Our block 509209 was
super lucky at 7.588% while our block 491758 was
super unlucky at 928.788% 
Some other pools represent luck in reverse for some reason
Thanks for the info!
A single block's luck is of course so random that it's completely meaningless to try and make any claims about the pool performance based on a single block.
It's all of course related to statistical samples.
A small sample of a large set of data is not going to give a useful representation of that data, and one single block is basically meaningless in that respect.
Aside: there's also the CDF column (that shows the chances of that happening) to compare with any of the very few pools that show that also.
The top two tables are what's useful to see the pool's performance.
The CDF[Erl] is actually the most useful number on the whole page ... and no other pool shows it
Seriously,
most if not all other pool operators have no idea about the statistics of mining.
slush is the best example of that - after running a pool for the longest of all pools, he still had no idea about checking the statistics of his miners in Dec 2015 when they all lost a truck load of BTC due to that.
Anyway, as the number of blocks increases, you get more useful data with the CDF[Erl] which is showing, in the top two tables, the probability of getting worse than that result.
There's also Luck% columns in the tables that show 50% luck as bad luck and 200% luck as good luck.
