LED, COCO, watering?

Hello, setup is posted below my question:

I vegged my plants for a good 5 weeks under T5 and had healthy grow, when I flipped to flower (i did go slow because it was not used to the strong LED) I've been noticing that my plants are staying short (they've not grown much since I flipped them, stunted like. The issue I'm having since this is my first grow is the amount of time that I should water/feed coco. I think because I have an LED light and it's not as hot as an HPS (hps lots of IR heat to help the plant drink?).

Currently I feed my plants that are in coco and perlite every other day but from what I've read you should feed every day in coco because the medium does not hold nuts as good as soil or promix?

My run off is about 100 PPM less then what I feed with (850PPM) with, so I'm not sure why that is...
PH on run off is 6.1 plant height is 16" or less....

This is my noob theorie, because I'm in coco and when I feed with run off most of the nuts will pretty much run right through and whatever the roots can absorb it will, therefore it would only make sense if I would water my plants everyday the root will be able to absorb more nutrients than just once every other day?? I could be totally wrong here and hope someone can help me out


COCO GROW

Strain - Green crack, Jean-Guy and CBD Rene
# of Plants - 3
Grow Type - coco
Grow Stage - Flower day 21
Bucket Size - 3 gallon
Lights - (1) Mars II 1600 (18' above canopy)
Nutrients - General Hydroponics calmag, FloraNova Bloom, enzymes, liquid cool bloom and diamond nectar 700-800 PPM at this stage.
Medium - 75% Perlite 25% Vermiculite
PPM - 900
PH - 5.9 6.1
RH - 50% to 55%
Room Temperature -68 night 78 day
Solution Temperature -65 to 69
Room Square Footage - 4' x 4' (not a tent) it's a small room 7 X5 and I'm using a 4X4 tray in the corner that I keep my 3 GAL pots in.
Pests - None

Any help will be appreciated very much, thanks!

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