How can I ensure very consistent color negative (and black and white) film development results?

Right now I use a Jobo CPE2 rotary processor or hand processing with a sous vide cooker (Cinestill brand) with Cinestill’s C41 kit for color and Ilfotec DDX for black and white.

I measure temperature with a digital thermometer and plan to use a densitometer to compare to reference strips. I use distilled water and wash/photoflo/dry film the same way every time.

Are there any key steps I am missing? I am developing film as a side business and have had good results so far, but want to deliver the best for my clients.