Sorry guys, life smacked me in the face, haven't been able to post the pics I promised yet, I'll do it first thing in the morning, here are some dried bud pics, literally pics of the bag appeal..... This is what I call the Batch 45 " A" pheno; Sativa dominant, 9-10 weeks, closer to 9, all gas. Cal Mag hungry, moderate to heavy feeder. Kinda crappy bud to leaf ratio, but EVERYONE loves the smoke. Very heady, very smooth too. I do a three week flush usually, (I love smooth smoke..)
You running soil-less medium?? or soil and chems?
Not sure what this "flush" is you speak of.
First off, chems in soil don't does not mean chems in flowers... that's physically and chemically impossible. IF what you want to remove excess nitrates, try just watering straight water, don't "flush" with excess water.
Doing that just drowns all the micro-organisms and the roots... doesn't change the flavor of the flowers.
What you do with that "flush" is basically stopping or slowing down and killing the plants growth. Not the best approach going down the stretch when we want out flowers to be putting on weight. Just sayin....
It's the micro-organisms that break down the excess fertilizer into nitrogen gas, drowning the micro-herd is actually doing the exact opposite of your intended result.
If you want better smoother tasting buds, try organic soil. Gonna be a lot easier work wise = mix soil, plant plants & water. I have the water and lights automated. I can go away for weeks at a time and don't have to do anything.
The thing with fertilizer is the plant grows too much leaf and so you're burning more chlorophyll which is harsh when you smoke it. By the time my plants are ready for harvest a lot of the leaves are very yellow or they already fell off, leaving me with a very easy trim job smooth tasty flowers and minimum cure time.
kicks the chem d terps but with colours, better structure, faster finishing times and density in my opinion. 2 phenos here 
