I have a question though. I'm getting an error about duplicate jobs when mining the algo kawpow with xmrig:
That shouldn't be an error, I see no reason for the miner to check it. If the duplicate job was treated as any other job it would work.
Whether the pool shoud not send the same job twice is a trivial issue.
Edit: after further thought my opinion is the miner is at fault here. The issue should be raised with the xmrig devs.
~snip~
I had a look at the xmrig source code and found that it closes the connection when it receives a duplicate job from a pool.
There's no real reason to do that in this case so I just commented out that part of the code and tested it.
After that change, xmrig works fine mining kawpow with zergpool even though the pool sends a duplicate job.
So it is safe to assume this is an xmrig issue, not a zergpool one.