If anyone is interested my 7 card rig with all GTX1070 FE is finally stable running for the past 72 hours with the following clocks and pl:

__CORE_OVERCLOCK_0=000
MEMORY_OVERCLOCK_0=1400

__CORE_OVERCLOCK_1=000
MEMORY_OVERCLOCK_1=1400

__CORE_OVERCLOCK_2=000
MEMORY_OVERCLOCK_2=1300

__CORE_OVERCLOCK_3=000
MEMORY_OVERCLOCK_3=1600  

__CORE_OVERCLOCK_4=000
MEMORY_OVERCLOCK_4=1400

__CORE_OVERCLOCK_5=000
MEMORY_OVERCLOCK_5=1300

__CORE_OVERCLOCK_6=000
MEMORY_OVERCLOCK_6=1200


INDIVIDUAL_POWERLIMIT_0=125

INDIVIDUAL_POWERLIMIT_1=125

INDIVIDUAL_POWERLIMIT_2=120

INDIVIDUAL_POWERLIMIT_3=130

INDIVIDUAL_POWERLIMIT_4=125

INDIVIDUAL_POWERLIMIT_5=120

INDIVIDUAL_POWERLIMIT_6=120

i determined the power limit for the cards by their individual temperature and lowered/increased their clocks accordingly, if i give them all the same power limit GPU 3 is 10 degrees C cooler then GPU 2/5/6 while GPU 0/1/4 are right in the middle, at the current power limits all the cards are pretty much the same temp plus or minus 1 degree.

i might be able to push GPUs 1-5 further, i suspect GPU 6 was causing my crashes since the last crash when it was clocked @ 1300 it was the only GPU to lose its sensor connections, since lowering it to 1200 everything is stable so there might be room for higher clocks on the rest of the cards.

wish there was a way to determine which are samsung and which are micron..