I put my V4BH through an Ampeg Classic 15 and Classic 2x10 and like you I've never been short of power, but I've also never had a problem getting it to distort & breakup. I restrung one of my Thunderbirds with flats to cut it back a bit, which worked. My amp setting are roughly Gain on 4, bass on 7, mid on 6, Frequency on 3, treble on 5 and master on 6