Gains and bass boost are set about 8/10, and then i'll adjust the bass via the remote. Checked the grounds and they are secure. Amp is mounted on top of the sub box, and has plenty of clearance around the heat sink. I rewired the subs/amp to using 2 channels with each sub in series at 4ohms and everything works fine now. Even sounds better when i turn it up since the headlights aren't flashing with every bass note anymore.