I always had problems with yellow tint. When I bought my iPad Air I couldn t stop noticing the yellow tint in the right side, it would drive me crazy, but I decided that after so many iPad 3 replacements without any good results, I d keep my Air.
Oh well, it has been a year and now I can t find any uniformity issies no matter how hard I look, really, my screen is perfect.
Today I got my iPhone 6 Plus. No bleeding, nice screen with bottom 1/3 slightly warmer then the rest. Am I going to replace it? No. I am positive that eventually I m not going to notice anything, 50% of the problem is in our head, once it gets older we are done with it.
iMac - bottom 1/3 warmer
Macbook Pro - right 1/3 warmer
iPad 3 - (4 replacements) all had one side warmer
iPhone 5s - top 1/4 warmer
iPad Air - right 1/3 warmer
Trust me, it might get better eventually, or you might stop noticing as much. I used to replace each of my apple devices 2 or 3 times. It will get better. Chances are the replacement might be worse and you end up regreting. So judge the one you have not expecting perfect uniformity before replacing it.