agreed with both above tips, especially the recommendations for a random source (Wogglebug, Ultra Random Analog, etc). Pamela’s New Workout is a good, dense modulation source, but with less immediate control than something like a Batumi or Stages.
I think the biggest question is: what do you want this rack to do? as mentioned, Rainmaker could be totally excessive, or could a the whole point of the rack, depending on your perspective.