There is definitely alot of information in your post(as usual). Though I think some of it might seem like overkill for some people. :p
Having said that, there are two questions that have come-up while I was reading through your post:
1. Can you explain how Chlorine is derived from acidified Sodium Chlorite?
I never tested any of my CDS for Chlorine, though the MSDS for my Sodium Chlorite states that it contains no heavy metals or contaminants other than inert bi-products. And I haven't heard of Chlorine being produced in a Chlorine Dioxide process either on the industrial or home-brew side of things.
2. What is/was the pH measured with your CDS?
I measured my own CDS when I first started making it, and found it to be consistent at/or around 6.5. I didn't check any lately though I haven't changed my recipe and so I doubt anything has changed since then.
Also, on the storage side of things, I noticed that if/when CDS is stored in a sealed bottle with no air gaps, that it could be stored at room temperature with no signs of degradation. However, I'm thinking that it would likely need to be refrigerated again prior to opening(or using). otherwise, the gas would likely escape at room temperature.
On the other hand, I've found CDS could keep for several months without any signs of loss when stored in sealed glass bottles in refrigerated(at 1c). I also found that sunlight destroys Chlorine Dioxide instantly, making cool smoke machine type of effects :p
Anyways, I think the pH question is sort of answered for the most part, though I'd be curious to hear your own experience on that. However, the Chlorine issue is of particular concern to me since it is quite a different chemical than Chlorine Dioxide and more importantly... having its own set of risks associated with it. And so I'm particularly interested in hearing more about that.