Folks, would love input from others that got into this same mess as me and how you got out of it.... First, I love the Marcus Miller tone - that is usually my goal. I just dropped in Aguilar J5 70's single coils into a Roscoe that has Jazz pickups. The bass already had the Bart NTMB preamp. The result - overly aggressive, shrill harsh highs, so-so mids, and thin low end. Super disappointing. I'm wondering if anyone else has tried this combo. I'm looking for alternatives - either lose the pickups (and put the stock Bart single coils back in) or lose the preamp for something smoother. Open to your suggestions.