You should be fine. It is about temperature and time. Don’t keep the nozzle heated up when it isn’t used. Don’t dry it frequently (keep it in a dry environment) and use low temperatures.

190° is the low end of printing temperatures. SainSmart should probably be okay when printed below 210°C

With “special” PVA like FormFutura Helios you go up to 250°C: formfutura.com/product/helios-support/

Regardless BVOH should be the better choice at higher cost.