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BMW and Mercedes guys swear by the pump extraction. They claim that removing the drain plug does not get all of the oil out. After a lot of reading, I have to agree with them, there are low spots in the sump and the 'sludge' collects there. Perhaps what you managed to dredge up was a bit of sludge. Had you pulled up on your hose a little bit, it might have pumped out the oil faster and better.
Yes, a larger diameter hose is called for, along with a warm engine block.
I like your extractor set up!
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Keeping it running is better than buying new
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