Personally, I think your plants look really good!! 1 or 2 yellow leaves on a plant with a nice canopy isnt unheard of. The fans have deep green color to them and only the fresh, brand new tips seem light colored. I agree with JD as maybe a 1/2 strength dose would get the tops a bit darker. But I also would say be careful feeding more when the fans are perfect, color/shape ect. like yours.
I think a higher dose of fert every other watering may be a bit too much for your plants if the fans are already that dark and perfect looking from a 1/3 dose. But one dose of 1/2 strength may not burn your plants, but every other watering may cause a build up and lead to... burn. The only bit of yellow I see is in the middle pic, not sure if it's the same plant or not. But the first and third pics look 100% healthy to me for a plant 2 weeks into flowering. I havent grown the cheese so im not sure if the lime green color on fresh new growth is the same growth tendency as with 5-6 of my strains. I have really light, light green almost yellow leaves that are on the very top of the buds, but as they get older..1 week they will darken up and look awesome. IMO, the newest growth during the first few weeks of flowering is a bit lighter than the almost black fan leaves that are 2-3-4 weeks old, and will darken up as the mature.
With my plants, If my fans are that color I keep the nutes the same. Where they are making a transition from veg to flowering, they will look different, as they start using different levels of nutes.
We really need to see the yellow brown tips you speak of.
I would suggest give one dose of 1/2 strength nutes and see what happens. If the tops lose their lime color, and get the green color back, good. I guess Im saying I would not up the nute program for good if those were my plants, unless there is yellowing/dying of 4 or more lower leaves, or the whole plant in general has become more light colored, If the leaves do not have perfect structure, you may need to up the nutes for the rest of the grow.
otherwise I would try one heavy dose( 1/2) and compare in 2-3 days. Good luck man, and like I said those are nice looking plants, hope they have some fatties for ya!!