OK solutions - but then do not write copper sulfate pentahydrate in the reactions. The temperature, mixing order, or two dropping funnels are also important. Closed or open system - it can all be important. I advise you to use deoxygenated solutions and argon as an inert gas. And watch the reaction carefully.
I don't believe in N2O - rather NO, or the mixture with NO2. Higher reagent concentrations can be obtained from Cu(NO3)2 and KNO2.