If they don't seem to have enough food it's probably because they don't have enough. Once per week masterblend is low for what is essentially hydroponic style growing.
The best way to do it is daily feeding with overwatering (so called drain to waste). When dealing with chemical fertilizers, that drain is imo essential to have a headache-free growing (salt buildup and nutrient lockdown, big swings in pH, etc).
Also, I personally think coco coir is inferior to good peat.
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