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For any miner, the best choice is generally to just use only the "n=" and "o=" password arguments to name and group your worker, and allow the mining server to determine the best configuration automatically using "i=." For this worker, for example, you might want to use "i=s9" as your only password arguments unless you have a reason to override specific settings.
The the reason for rejection is ;
Rejected Share Reason Error Rate
The submitted share's difficulty of 0.219152636923 is too easy; a single difficulty of 0.25 allowed for this algorithm
Shall i also set min difficulty to 0.25? Was thinking correct / optimale setting is done when i=e92 is used?