Whats your average growth per day in hydro?

Im growing in a 12-site ebb&gro bucket system.
For some reason, my growth rates are slow as hell! On average about 0.35" per day.
Im running Botanicare PureblendPro nutrients, and Botanicare additives..
My temps and humidity are perfect, my reservoir is perfect temp, and aerated very well.
They get lots of air circulation, as well as CO2 running on a controller.
They are growing in hydroton, after starting out in rockwool cubes. Like ive always done.
Ive tried using the full line of additives, ive tried using ONLY base nutes.. no difference.
Every aspect of my grow is perfect as far as I know, and i have NO pests.. very clean room.

So how much daily growth is everybody else getting in their hydro or ebb&flow systems?
And does anybody have any ideas why things are going so slow?

1-3 inches per day.

yeah, you really didnt give us much info at all other than everything is perfect. 1-3" per day is common on all of my strains and i use the full line of pure blend pro and additives. i have a great recipe in my hydro thread, my 3 stages of flower.

Lights play a key role in growth,i vegged(12/12 from seed) an unknown under 400w MH and cloned her and then put her and clones under hps they outgrew her in 2 weeks.
But they are more leggy than her.mom is about 1 1/2 ft and flowering and the clones about 2ft and flowering slowly.

Let me elaborate..

My room is roughly 50% humidity and 77 degrees f.
Reservoir temperature is roughly 66-67 degrees f.
pH in the reservoir is between 5.8-6.2, usually around 5.9.
Plenty of aeration and circulation in the reservoir.
Plenty of air circulation in the room.
I have 12 plants under 2x 1,000w lights.

Running Botanicare PureBlendPro nutrients..
Ive tried using the additives, ive also tried using JUST the base nutrient.

Im flooding every 3 hours for 15 minutes at a time.

Thats my definition of things being "perfect"..

So does anybody see any reason why im getting such slow growth?
As well as nutrient deficiency symptoms on some of the plants?

Maybe the 1-part organic nutrient is the problem?
Maybe i should try giving them synthetic chemical based nutrients instead?

I have no idea, but its driving me insane.. Any ideas?