too yellow or am i paranoid

i have been using Better Grow Orchid Plus with an NPK of 20-14-13 through the 6.5 weeks of veg and now have switched to Better Grow Orchid Bloomer Booster with an NPK of 11-35-15. I used the nutes at about half strength and started the Bloom at about 1/4 strength when I went to 12/12. I gave straight water for maybe 2 or 3 watering because i thought they looked yellowish (6 out of plants turned out male, will the nutes have this effect?), now at about 3 weeks of 12/12 i want to start giving the orchid boost of 11-35-15 again should i go 1/8 strength?
here is a photo of the bottom of the plant were it is yellowish, is this too yellow? also i started in solo cups, repotted them and now the plants have been in 2 liter soda bottles for about 4 and a half weeks. i feel salt build up is going to be a problem. I have also been leaf feeding them as well as mixing nutes in with my water

http://bayimg.com/OakpaaacM

go back to the grow! using a bloom booster as a veg food is more times than not a bad idea ( i would say never a good idea but someone will probably come along and tell me they do it and it works great for them or something), you are using too much phosphorus and not enough nitrogen. I would either go back to the grow or use something as close to 3-1-2 npk as possible. 1-3-2 npk is the target for blooming which is closer to what you are giving them now.

i'm 3 weeks into flowering though, i thought i should switch to the bloom. I have pistils sprouting, but i also have purple stems and branches. i will go back to the grow but when should i start using the bloom?

i think your fine. I think most new growth has a little lighter color when first growing in. Your plants look very healthy from what I can see so your probably better at using your nutes than me. If I were you I would waTCH THIS GROWTH CLKOSELY FOR A few days and than see if it greens up or goes yellower. Depending on what size your plants (this looks like some very low foliage) and how much light there is you may want to just trim off some of this growth if it's not getting much light so your plant can focus more on the parts that are.

i didn't realize you were in bloom, i thought you were just 6.5 weeks in veg... anyways, watch it closely.. if it starts to fade yellow give them a dose of grow. It's ok to alternate feedings as well, the name of the game is to keep em green! I usually like to stick with my grow ferts the first few weeks of flower or at least alternate because there really isn't much bud growth, the plant is shooting and need that extra N.

i'm going to give them some grow and see what happens thanks for weighing in!
do you think i should get some aluminum sulfate? my ph tester is a piece of trash but says my ph is over 7. could this be effecting the plant?