Yep have to say after trying to be sensible, I took the plunge and cross flashed.
I gritted my teeth and flashed successfully founders, palit super jetstream and asus strix to my evga 1070 sc.
Limited testing so far but power limit increased on both compared to stock bios.
Strix @120% showing more watts used in hwinfo up from 165w to 190w peak and less tdp throttling.
Palit @114% does not show watts in hwinfo but again less tdp throttling.
EVGA have not increased the TDP in bios for SC, its the same as founders (confirmed by flashing FE bios)
More testing and screenshots to come
The FTW seems to let me use 130%, at least in afterburner and inprecision-X, I am honestly not used to software OC, I have mostly used direct bios editing as my preferred method so I am not as educated on the software OC interfaces.