I think you did a fantastic job. No doubt some will expose and find flaws with your poll but I hope it is only a small minority. We should all be grateful that you took so much time and effort to make this information available.
We can all draw varying conclusions from this information. However, rather than be critical at the the accuracy of the results, which we all know is only as accurate as the data you collected - this is true, we can use this as a statistical tool to help us form our conclusions about the share distribution. Maybe we add this information to our individual DD and alo raise valid questions to help us understand the SP behavior as of late.
Once again, Thank you Rob