My band mates showed up with an upright bass. They asked me to learn to play it and to leave the Danelectro at home. The bass has Weed Wacker strings and 1 Shadow pickup mounted on (not under) the bridge. Of course, they play very loudly. I can barely hear myself, I'm getting blisters from hitting the bass so hard, the tone sounds thin to me even though the amps at the studio where we practice are typically around 300-350 watts and I'm battling feedback. I stuffed foam under the neck and tailpiece. Ran strips of velcro through the strings between the bridge and tailpiece. I'm using a 7 band Boss EQ and a digital reverb pedal (since we are a trio) although I might switch over to a delay pedal for slapback instead. My questions: Are there any preamps that anyone can recommend that will work well (louder and punchier sound without feedback) with the strings and pickup that I am currently using? Am I going to have to change strings/pickup? I'm going to be using a GK-MB800 with a 4x10 cabinet. Thank you!