The VW has Bosch 440 injectors in it, I think max flow is approx 1.5l/min at 15psi boost. 20% water would equal 300cc/min and 4 0.3mm jets would supply approx 320cc/min so not far off.
Nozzle placement directly after IC would give more time for water to cool the charge air, close to the log manifold may leave you with bigger droplets that won`t navigate the manifold as well?. It`s trial and error to a point, you need to find out what the best spot is for your engine.
Have you go any pictures of your engine setup?.
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VW Mk2 Golf 16VG60 - Mitsubishi GTO TT
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