Hi Ben
The
nutrient I use (Formula One A & B) is 7-0-5 and 1-6-6 so I wouldn't worry to much about those numbers as long as it's formulated for hydroponics and not for dirt.
By adding more nutrient solution it will raise the N-P-K in equal amounts..
If you suspect that your nutrient solution is way off I would dump it and mix up a new batch.
Ron