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You made complete sense. Is there no way of updating the old blog to your site design? A few questions you could ask yourself to figure out if it's worth moving to the subfolder and leaving the subdomain where it is: Does the old blog get much traffic? Does it have many links and shares? How old is it and how many posts are there? Despite that, if you do move to /blog the best case scenario is still to 301 redirect old posts to a new unique URL for each post if you can. From what you say I'd also think the new design will look more professional and therefore, potentially lead to more sales.

I will try that.  Thank you Erik for your input.

Will do, thanks Matt. We have quite a bit in this new design, so we are staying with the platform. BC is great as far as uptime, etc. We actually left Volusion after 6 years to move here.

Thanks @iPullRank.  There are so many moving parts here and we have decided it is just beyond our understanding to get this fixed.  We've decided to work with the folks at Portent Interactive to start a long term fix.  Thank you, everyone, for your feedback and assistance. If there is one thing I've learned it's that we need to be working with trustworthy folks like those within the Moz community.