I over exposed color negative by one stop, same as b/w negative, negative have greater exposure latitude than transparency, over exposed by one stop you still can keep the highlight details and without not losing the shadow details.
I just simply dial +1 to the exposure compensation, because most of the time I only shoot negative, and using center weighted metering, I find the color will be more saturate with over exposed the negative by one stop.
You have to run some test before you adopt this method.
Hope this help.