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If airflow is too low, most likely one of the flaps is NOT closing when it should - so your airflow is NOT working properly even though it seems like it. Which, oddly enough, is exactly what Tim discovered! The defrost is a usual suspect because it defaults to full open with zero vacuum signal. It's more common to have a failed rubber diaphragm in the vacuum actuator pods, I don't often hear of the electrical valves failing. But you need to check everything, like Tim did.
BTW, if the foam tube under the dash is crumbled, there's a nice W140 water drain foam piece that is the perfect size & shape to replace it. It's wire reinforced as well so it can't collapse. I used this to fix mine. Here's a photo:
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