the fact is that low impedance injectors (peak and hold injectors) are designed to be low resistance to allow for higher power at the instant they are commanded to open = "peak" and then the drive power is reduced for the "hold" part.
series resistors prevent the high turn on power making sluggish opening and also prevent the injector closing circuitry operating correctly as well, resulting in sluggish closing too = BOTCH UP.
Correct. You may as well just use the saturated coils instead,