We cant see your images
Well your nitro has either samsung, elpida or hynix memory. Didnt see any micron ones. anyways, its really easy to modify timings with Polaris Bios Editor and atiwinflash. For elpida memory its a bit different, but there are roms out there that are already done. Dont forget to backup the original
Go to my website, there are links to various roms that you can use.
http://www.cryptominingtalk.com/flashing-bios/ May I add after you change your timings, set the memory to 2000 for example, and reboot your rig. then you should see a hashrate difference. Seems like there are a lot of people that want custom roms, even though its pretty easy to do it yourself. I could do it for you, but i'd have to charge you lol