thanks for the input, Jimmy and Wolf. The tension tool looks really interesting. If I decide to go deeper into the guitar science/building field I will certainly look into it more.
Wolf, I understand your point about picking what's right for me. I think at this point I will use Pyramids for the shortie and maybe try TI's on my long scale, if I find that I can adjust to the lower tension.
Anyone with thoughts about guitar strings from these two brands?