I've settled on a tuning on my new 7 string guitar which is A, D, G, C, F, A, D. Off the shelf packs don't seem to be quite working for me. You can get a nice tight low end using 11's, but for soloing, the 3 high strings have too much tension for me. I use D'addario XL's heavy bottom 10 to 52 on my 6 strings. I want to use the same gauge strings, but add a .60 on the low A. Anyone know if or where you can buy additional individual strings?