Brand New Deep Cycle Batteries Keep Dying Overnight

How did you measure your parasitic drain of 2.35 amps? I would measure the draw by removing the neg cable and inserting the leads from your multimeter set on 10 amps between the neg cable and neg post. Then do the same on your starting battery. What do these read? If draw is only on the house batteries, pull each fuse in the 12v panel to see which one removes the draw then you will be able to isolate which circuit is causing the drain.