yes the new version of braiins supports asic boost > https://bitcointalksearch.org/topic/braiins-os-braiins-os-custom-asic-firmware-optimize-performance-efficiency-5036844
can you point your miner at a pool ? lie ck, kano,slushpool? it will be more accurate to watch from there rather than nicehash
some people claimed bitmain has a backdoor that they can use to shut down / direct hashpower etc, , i personally can not confirm nor deny the existing of such a thing, but i am pretty sure bitmain won't risk using that backdoor now "assuming it exists", it will be very easy to spot and they will be in a big trouble, i highly doubt anything like that.
edit :
this just crossed my mined, if you using a nicehash server that is far from the miner location, latency could be super high, your shares do not get submitted, thus it shows 0 sometimes, if you don't want or can't ditch nh then at least pick the closest server to you, if you are in EU you don't want to be pointed at USA based server.