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What do you think about the performance of different pools? I.e. could the luck be different depends on the backend of the pool?
In this case the quality of dashboard and even pool's fees are not so important if your luck is better then others because of pool's performance.
Luck should average around 100%
Luck does not 'correct' itself, it simply approaches 100%
e.g. if your luck was 80%, it would approach 100% by being 100% for the long term future
A pool
can't make it go higher without giving away BTC to make it appear higher, but yes problems with their code and their bitcoin network connectivity can make it lower.
It can be higher or lower, of course due to luck, but that is just an historical observation, not an expected future result.
The expected future result should be 100% (less orphans)
Code 'problems' of course include trying to rip off their miners.
A simple example would be slush.
They supply a 'proof' set of data, that they claim proves they are doing the right thing.
Alas, that 'proof' doesn't prove the pool hash rate, it proves a lower limit on the pool hash rate.
Which leads to the obvious issues that can allow.