Normally around week 8 or 9 they start to fade as they finish, and flushing can bring this on faster. Which week are you in now?
Some of them have definitely suffered, but you should still get a good harvest.
Flushing with any nutrient is not flushing. I'm guessing you're not using living soil, because flushing it isn't the best idea... what medium are you in? The more info you give, the easier it is to help.
If you have fed at the wrong ph there are probably a lot of nutrients in the soil that haven't been up taken by the plant that were locked out due to ph, so I wouldn't feed more, especially if you are in week 9 or 10.
I would rather use plain ph'd water for the last bit and let the plant use what is has in the soil.