Also, depending on how round the drops are coming out in your test, then we can determine an additive for the water.
I think some cooking starch, or Xantam gum will work to make the drops more stable and round, but it will only work if you have something close to 2 bar absolute pressure on the water + gum mix at the nozzles.. If not, it just turns to gel.
Xanthan gum - Wikipedia, the free encyclopedia