How much fertilizer to use - or should I more correctly say, the concentration applied - should be determined based upon the feeding frequency.
When I metered fertilizer in my irrigation water, I typically watered 2 or 3 times a week, and I found 25 ppm N to be a good concentration. If you divide 2.3 by the %N in the fertilizer, the result is the ml/L for that level in the as-delivered irrigation solution. 2.3/7=0.33ml/L for your 7-7-7.
If your Dosatron is set for a 1:100 ratio, you should mix that liquid fertilizer with water in your feed tank so that it is 0.33x100=33ml/L.
If you only water once a week, you should probably consider a concentration in the 50-75 ppm N range, so double or triple that tank concentration.
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brammn 
Hybrid Mode
