I am also struggling to get 26 in Speaking section. Check this out .... I found it on the website:
http://www.state.gov/documents/organization/87007.pdf
It seems to me that obtaining a passing English test score is required by law( in order to be certified to practice the profession)...I think this applies to pharmacists also. I just found it and now I understand why NABP requires 26 in Speaking section.
I might be wrong ..let me know...I am not an expert.