Here is the question

When I set up either scrypt or x11 nicehash order, using BTC auto conversion, the pool always determines a conversion coin as Syscoin instead the BTC. I always use c=BTC notation and try 4 BTC addresses. Still no luck - syscoin. So what do you recommend to try?
UPD, Well I've got some luck with my NH address

will stick with it for now.
Hello,
I looked into the system to see and I did in fact find an address that is currently mining using Syscoin as the payout. Your connection details look fine, the interesting thing is that when I perform a validateaddress on your BTC address its valid, and apparently Syscoin also thinks that is a valid address for it as well. Thank you for bringing this to my attention, and I have manually changed the system into now thinking you are a BTC address. We'll monitor your account as the balance begins to mature to ensure everything is smooth.
This is something we'll look into further, but I assume some SYS and BTC segwit addresses have similar formats, thus confusing the system. For the time being, we'll also disable SYS until we can confirm it isn't misunderstanding user's choice.
EDIT: Just wanted to add that since we made the change to BTC, your graph on the wallet page will appear a bit odd for the next 24 hrs while the system realizes the change in expected confirmations.