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So, been using DoubleTwist with the new build that creates "sandbox" folder on the SD card as per KitKat rules fo about 3 weeks and it work great! 50GB of music on my 64GB card.
Problem solved!
I rip my music using iTunes then copy the album file over only the external card. I use Rocket Player which I find to be even better than PowerAmp (which I found better than DoubleTwist).