Of my last 500 generated blocks, 41 orphans.
i am so sad that you encounter the problem,,,,
I have less than 5% orphans thats very good, before i had 95% orphan. And it is not possible to eleminare orphans totally at such a low hashrate.
Maybe worth a thougt to change the algo to something new like cuckoo cycle. Because it will be very easy to get 51% with the upcoming scrypt-Asics.