I've also had problems with NOS-fitted ships shutting down my Rifter (twice lately). So I'm thinking about fitting a Small Diminishing Power System Drain instead of the RL II.

You have less dps from the loss of the RL, but cap is a lot more stable. I can fit the NOS + 3 x 150mm Light ACI II. Have you ever tried fitting a NOS, do you have any thoughts on this? Thx