Those big grounds are located underneath about where the BOV is, and also near the bottom of the battery tray. Our car is also heavily modified, but we didn't move the grounds very far. Of course you can easily find the battery ground.
I think you are drawing too much current because of the grounds, but in talking with my son yesterday about this, he reminded me we are using 0 AWG with our trunk mount.
If it were me, I would take out the battery, and get a good visual on those grounds, loosen them, check them out, etc, then put it back together with 2 AWG cable on both batt wires.
Very nice engine bay.
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