@DougDawson i find you to be a honorable OG, Thank you for your kind words. Indica in general is recommended for back pain, there are several reason for back pain as I’m sure you are aware. My back pain is caused by continuous over use during my careers like being a TIG welder for a art foundry, marble and granite masonry and fabricator all took an extreme toll on me. The SBT is sativa dominant and gets tall if allowed, as seen here:
The sour grape worked great for my back pain, might not be the same for you. About 80% of the people I attend PTSD meetings with are veterans with several forms of pain, each of us look for entourage that works for the individual user. I like a good 50/50 hybrid like harlequin, when I mixed sour grape and SBT it strengthened the indica pain blocking and provided a sativa cerebral happiness. Now for my opinion on which BOG seeds would be best for your med needs… all of them. 
I will definitely be in attendance at your BOG grow, keep being awesome.