In my experience, the only starter you might need would be for the C41 developer which 'preseasons' the developer.
The RA color paper replenisher and the bleach and fix solutions don't need starter. In fact, I like the RA paper replensiher as-is. It gives a good result with no starter. I use RA-RT in 10 L kits split to 5 liter all the time.