For the record - I really like what this has evolved into, although I can't take much credit for it. It's more a product of the many suggestion and comments that everyone has taken the time to provide - Thank You!
- I shifted the left grouping to the right so the oyaishi sits precisely 12" from the left wall of the tank (1/3 of the tank length.)
- I tightened the intra-stone spacing in the the groups
- Although it shows poorly in the photographs, I created a ridge that runs the length of the tank, and gently arcs from the front-left corner to the right rear corner. I think this provides a "connection" between the groupings despite their distance.
- Strangely enough, the most challenging stone to place was the small "bump" stone that sits by itself. I must have moved, rotated and tried removing that stone a thousand time. Without it - the separation of the groups seemed to "contrived". I'm curious to see everyone's opinion.
Sorry for all the reflections - I was short on time this morning...