remove xnsub.. in my case that removed the rejects

wich pool, xnsub on?
I am getting between 10% and 17% rejects on nicehash. Is there anything I can do to reduce that?
Latest fw 1116, nicehash. xnsub on.
Hi, with blockmasters i do not have xnub (stratum+tcp://eu.blockmasters.co:4533) but a lot of rejections.
should I add xsnub to get (stratum+tcp://eu.blockmasters.co:4533#xsnub)