Newbie Mining... Bios

Hi

I have 3 x Sapphire AMD Radeon RX 580 8GB NITRO+ and 3 x AMD Radeon RX 580 GTR Black Edition 8GB Crimson. (on one rig)

I've build the system and it mines nicely using claymore. each card produces 22mh/s and runs stable in linux and windows.

However I want more out of the cards if possible, - Ive googled everything and looks like you use Polaris Bios editor however all the timing are completely different to the 1750 and 2000 that are all over the web? when I load the bios off each card they disable 220000 for example. Which bios should I use for these cards? or is there a way I can see the timing in 1750 for example? as I would prefer to edit the bios I've just saved off the card (with having a backup) and then upload it. I'm stuck now - thinking that I bought the wrong cards especially the xfx ones. using the util PBE (I think) comes up with more sensible figures however I cant seem to be able to change them.

If I gave the bios's to someone could they edited it for me?

thanks in advance, hopefully someone can point me in the right direction,

Thanks