If you want to use bowls with Grado RS1, than MAD EAR was the best I've heard. I've had Mad Ear, Woo Audio W6 and Little Dot +.
But I prefer Flats with Grado's and Flats and Tube Amps don't really work. But Flats with the Vali works best for me. Flats with Hybrid Tube seems to work best.