Perhaps most everyone attempting simulation in Kicad finds both success and shortcomings with NGspice…
I’ve had the various success’s and shortcoming’s and prefer LTspice but, I often want to do the schematic in Kicad - thus, I compromise, as follows:
I export a Netlist from Kicad and use it in LTspice and Run LTspice directly from Kicad.
Link to my post containing my comment/how-to-do it… with additional post/info Details in this Post