Best extract/source for back pain?

I take Kratom to keep moving at work, being 6'8" and washing dishes/prep cooking, I end up with a good deal of back pain.

I have found that Red Maeng Da did absolute wonders for my back, while I could tell the pain was there, it was backgrounded. And unlike norco I wasnt an ass on it xD

Anyways, I have run out, I have a bag of green borneo and it does nothing for me. Kratom has by far the most unpleasant taste, so I hated taking it at the same time. I want to try extracts, but I dont know where is a good source for them, what will do best with back pain (im assuming red vein, though), and who has the best prices of these.

If you have any tips for beginning extract use as well, I would love to hear them!