-snip-
and small rigs with small hashrates should find hitting high numbers very rare as compared to high hashrate rigs.
ie a s21xp should hit more high numbers than a bitaxe gamma.
why is that the s21xp hash 270th and the gamma has 1th
so it has 270x chances to hit a high share over the gamma.
If its truly random, then a low hash rate miner has an equal chance of landing on a good nonce as a faster miner. In essence you could be issued a nonce that only requires one hash in order to find a share bigger than the network target.
In theory at least, the only advantage a faster miner has is that it uncovers more hashes than a slower miner so covers a bigger search area in the same time. nevertheless, any miner is capable of being lucky provided it is issued with a lucky nonce.
What I'm still uncertain of the driving mechanism behind how nonce values are created and distributed to individual miners and if there's any network manipulation of this mechanism.
As to the low returned share values, I have no idea what causes it but its clear to see if you view your log files regularly a pattern does start to show itself.
at a few leaves and missing the forest.