Can you please provide proper stratum reject messages? It's quite annoying not being able to get device specific reject rates.
We are actually sending them properly, there is a known bug in sgminer that won't properly display them if they're sent too fast (
https://github.com/sgminer-dev/sgminer/issues/119)
Regardless, we'll be adding a patch (a slight delay before reporting rejects) for this in our next version.