So i just tried Polaris Bios Editor v1.6.7 for the first time to test out it's "one click timing patch" And it works great. I got an extra 1MH/s per card on my elpida/micron cards.
For anyone modding their cards or having trouble getting a good hashrate, i highly recommend using this version and the one click method. It doesn't just copy the timing for you, it replaces the timing to what it knows to be the best for that card. https://github.com/jaschaknack/PolarisBiosEditor