isnt Vnish asic.to? Been running asic.to on my s17s for over a year and love it.
How much extra hashpower are you actually getting out of the firmware upgrade and are you still using stock cooling?
I did early tests with HiveOS and remember getting 63-65th but that was dead of winter in a large warehouse. Due to the constants of where I'm mining now I don't OC, I use the custom firmware to fit my wattage and cooling limitations. I'm mining in a warm climate (SW desert) so heat is number 1 to deal with. With asic.to I can have thermal limits for swapping profiles. Stock firmware can't do 1/3 of the things the other 3rd party firmware can do. Current settings for the S17, 50.8th at 525Mhz for 1971 watts.