Ahh, I did the comparison graph, and after 10 years, it would be 21,868 for VTSAX, and 20,508 for VFIAX. So while that would not seem like much, if you were to add 2 zero's, that would become 2,186,800 and 2,050,800. Over my lifetime, two zero's is not that far-fetched. And 130,000 is 4-5 extra FIRE years just on the principal.
So yeah, I think I'm going to keep my VFIAX where it is and DRIP, but switch to funding VTSAX.