Trunk Mount Batt. Opinions needed

I was having a hard time with mine. I put lugs for ground on the frame in a few spots, ran #1 welding cable to starter, ran #4 from alt to shutoff back to battery. I also have a big diesel battery. All of these together made the difference. No issues now. I was draining the battery every time I drove, hard, slow crank when hot. Now is all good. I should add, 440, trick flow 240, quench motor, powermaster starter buried in TTI 440-200. I heard lots of timing talk, but it didn’t crank with the ignition off either