Need help with Earth Juice feeding

I will try to post some pictures of my plants, but here is the question. Am I making the feed right and why do my plants now have a yellow color to all the leafs and some have black tips curling up?

I used ( pre 1gl of water 7.1ph and 110ppm at the start) All earth Juice products
Grow 3 TBsp
Bloom 1 TBsp
Catalyst 1 tsp

It dropped PH like normal and about 28hours later I was at 6.3PH and 860ppm, and I feed about pint to each plant that is in a 5 gallon bucket of soil. Now the soil is Cedar Grove potting soil organic that you can buy from Home depot. The room is 8' x 6' and Im running one 1000w MH. I have fan moving across the green and a 6" fan ducting air thur the light and out of the room. I have freash air coming in too. Room stays 75F to 79F with lights on and 69F to 72F with lights off. I feed about every three days and water on the every 3rd time of feed. I have been building up on the the Grow (N) over the last few weeks I started with 1TBsp grow once they where put in their flowing pots 5 weeks ago. Like I said I will try to load the pictures up, thanks for any help.