^^Correct. But the only way daisy chaining grounds will be more effective than just using the body is if the grounds total resistance is lower than the body, which it should be being you are using copper instead of steel.
To me it just seems like a lot of leg work for very minimal gains, though I'm kind of surprised by your mileage increase. That in itself has me really pondering, lol.
Don't "think outside the box".
There is no box.
Do it correct, or do it twice.