hello,,
i mine zcash and have 3 cards msi rx470 and my hash rate in claymore is 800
and i use flypool and my hashrates in this site is 733.3H/s 778.7H/s
what is real for hash and how can i know my real hash for any pool ??
claymore charges fees so 800 x 2 percent fee is about 784
784 is close to 778
to see perfect numbers in your case 784 over and over and over would be hard.
the best you can do is to expect a flux like 760 to 810
you won't ever be perfectly sure if you are getting every penny you should get.