How much liquid detergent should be used per load in 8kg machine with 3kg cloths?

I am working on a liquid laundry detergent product and adjusting all aspects of it.

In an automatic 8kg laundry machine, if we wash around 3kg clothes per load, how much liquid detergent should be used if the detergent has 8% active surfactant+ 4% STPP + 0.2% CMC and pH 11 and wash water is very hard? 

On internet they say things like 1 or 2 tablespoon which is not enough. 
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