You have to check really close if the coolant leak is from the WP seal, or below the WP. if it's below, you need to fix/replace the coolant pipe. The way you describe the symptom ("5. While letting car warmup last night, car shut off and I found fluid all over the place. Upon inspection, fluid seems to be dripping from the area of where the water pump would be I guess, not the expansion tank or any of the hoses I installed. When I put more fluid in, it just leaks back out") it looks like it's the cooling pipe, but I can be wrong. On the bright side, it's not a hard DIY, but there's quite a few ends and odds that have to come out. And you need to also change the manifold gasket among other stuff (If this is what you have).

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Stable: e92is, e46 M54B25, e83 N52, e53 N62 - sold, e39 M54B30 R.I.P.