First copied 1750 mem strap to 2000 (tried 1625 also), also unlocked the max mem frequency, then flashed the bios , then played  a few days with wattman, watttool , afterburner to find out the "sweat spot" for gpu frequency/voltage , mem frequency/voltage , max undervolting i can archive without stability issue. After 24-36 hours stable run , modded the bios with those numbers i got from watttman ,watttools,  afterburner.

Used the card for another 36 hours on my single card setup test bench mining ETH , after 36 hours stable mining on the test bench, i built a 7 cards rig from RX470/8GB cards

Sorry im not going to share my modded bios. The main reason is : its not working with all of my cards , i ordered 7 cards for the new rig i built , its ok for 5 cards , but the another two give me some stability issues , so with that cards i had to do the same process again to find the " sweet spot " numbers ...
If you can not mod ur bios with basic tools, u can not fix it if something going bad with the flashing process ... or the modded bios is to heavy for your cards and u bricked your cards ...