I would like to position the TWA in such a way as too get more effect on the mid to treble spectrum . The recommended mounting position really affects the bass too much for my tastes. Also, trying to get more effect on the treble strings just leads to a lot of clipping issues.
I see lots of people offset the TWA to affect how it sounds, just keep it in the lower bout for the most resonance.
If you're clipping too much in the treble, you can either lower the master gain or make some adjustments to the Notch Filters. Is your pickup not equipped with a preamp to make these adjustments?