If you can get the number off the xicon inductor, you should be able to look up the resistance at 1khz, I think that's what's on the data sheet. Also, that schematic seems to have left out the pot that's in series with the cap and inductor. This is getting wired like a tone control, right, so one side of the pot to the hot, and the wiper to the cap, then to the inductor (+/- a resistor in parallel like the Bill Lawrence Q filter) to ground. The other end of the pot isn't grounded.
Anyway, to me, you're going about this wrong. You know the values from the formula, and what it sounds like now, so why not use your ear at this point. If the current torres values cut too much treble, try a smaller cap. If that doesn't cut enough mids, you can go back to the same cap and use a bigger inductor . . . or both sides of the transformer xicon mini transformer.
I don't think you'll find your sweet spot with the formula, but I am very curious to hear how it works out.
Todd
PS) I have a 6 way rotary switch wired up with 3 different cap values and two different inductors to give 6 different tone control choices on the guitar I'm working on now. Two are standard tone controls with just a cap, the others are different notch filters. Almost at the point I can wire it in.
PPS ) http://guitarnuts2.proboards45.com/index.c...3605&page=1