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So I removed the waterpump, checked and carefully re-positioned the pipe, and buttoned up the waterpump. Car drove fine and dry on shakedown run. Leaked out all coolant the next day via a steady drip from the same pipe. Pressurized and confirmed leak at pipe. Removed waterpump yet again, replaced the seal and added some silicone for good measure. Drip still there.
The waterpump was sourced aftermarket and is the URO brand (pn 11 51 1 713 266). Do the pipes go out of round? I'm thinking the water pump or the pipe is out of round. My frustration is such I am actually considering putting the old water pump back on just to end my headache.