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I dont understand the bios modding. What am I to be changing on my Polaris cards I am only get roughly 20mh/s out of them on ETH.

When i load the bios following instructions, they say change timing, the timings are all kinds of crazy hex numbers.

I also get an error about my bois being too small

You cannot use GPU-Z to save the BIOS as it only saves half of modern bioses. You must use ati flash to save the bios. You are copying the memory straps from either 1500 (hynix, micron and elpida) or 1750 (samsung) and pasting it to all memory straps higher than it, such as 1650, 1700, etc up to 2000 or higher. This makes the memory run with tighter memory settings so hashes more. But it can also make the card unstable and/or crash.

How do I tell memory brand... also I am using ATI flash to pull them. They appear to already read as 2000 as thier default memory speed?

When you start GPU-Z, it reports the memory brand. Also use the following article for BIOS flashing as it tells you the correct Polaris BIOS editor version to use in order to get rid of the craxy hex numbers you're seeing:
http://1stminingrig.com/sapphire-nitro-rx-470-8gb-oc-bios-flash-mod-tutorial-hynix-samsung/

Okay all m y cards are hynix so I can OC them a bit? My screen for timing looks nothing like his.

You are using outdated version of PBE. Find a good step by step instruction with the links to the 1.4.1 version

The most current version of PBE is v1.6. It now includes 'one click' bundled performance timings. Very easy to use. Just save your original Bios using Atiwinflash and open it in PBE. The 'one click' option automatically applies the bundled performance timings and then save the bBios and flash it using Atiwinflash.

https://bitcointalk.org/index.php?topic=1433925.msg21518785#msg21518785

This version applies performance timings to the 2000 strap by default. Any way to get it to apply performance timings to a lower strap?

The timing is applied according to what your cards memory type is. If you want you could copy it to the other timings manually by clicking on the strap you want to change and using the box on the bottom. I found it wasn't necessary and the cards are more stable than when I was just copying the 1500 Mhz strap to the higher frequencies.