I took the starter back in to get tested and be 100% it wasn't the starter itself. Starter tested fine again.
I bought 2 extra ground straps and installed them. Now the starter is making a clicking sound and trying to turn over! So that's improvement at least. Seems like I still need to add some more ground points to reduce resistance to the starter. Either that or the battery needs to be charged from trying to start the car so many times.
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