If you still not satisfied better to ask slushpool in their official thread they can gives you more insight about your issue..
https://bitcointalk.org/index.php?topic=1976.22660
If you really wanted to earn higher i suggest to go kano pool and the pool fee is 0.9% which is great.. they pay higher than other pool base on what i experienced..
Check it here https://bitcointalksearch.org/topic/kanopool-kanois-lowest-09-fee-since-2014-worldwide-2432-blocks-789369
Thanks!
I'll look into kano after my first payout from slush. Only have been a member for a couple of weeks.
I'll ask on that other thread. It's just that obviously I have problems w two miners and want to know how to troubleshoot them.