Wondering which color I should go with to fix this brass?

I have very long hair and it has been dyed several times. Bleached only once, all the other times just brown dyes so it isn't in horrible condition but not great either. I really want to try and get back to my natural color - the closest I can find is Clairol 5AA Lightest Ultra Cool Brown, BUT I'm not sure how that will react on my medium faded brown with TONS of orange/brass, AND I'm worried it might be too light for what color my hair is now. I have been using a double N color as to not risk any adverse reactions and to get it to hold longer (Clairol 6NN6NN Dark Rich Neutral Brown ) and though its a great color, not very close to my natural. My question is does anyone think the 5AA would be a good idea or should I stick with what I've been using? I've included a picture of my hair (hope that's allowed!) to help.