you've seen it before...now help me!

I am not too familiar with disease and dignosis but here are my pictures. I assume that this comes down to a nutrient defficiency - particularly phosphorous, or possibly the top leaves are too close to the light.

A little about my setup: we are running an air cooled 400W HPS and it was hanging about 1 to 1.5 inches from the closest plants and gives off very little heat. It is about 60-70 deg F in the room with 60% humidity.

The nutrients are a local hydroponic store recommendation containing nearly all organics. It is a flowering mixture of 2-4-5 has a large amount of natural sugars. And we have also added monster bloom to help with budding and natural oil production. Water temp is about 68F and the pH is kept constantly around 6.5

My concern for these plants which are on approx week 3 of flowering is that numerous lower buds are getting a fair amt. of crystals while the top colas that were closest to the light are slow to get trichomes. The colas are tied down to get them further from light and limit vertical growth in case you didn't notice. Any help is appreciated.