3C is a much bigger drop than the spread between most blocks in Joe's first shootout. Wonder if differences in clamping pressure may play a role? What about flow rates? Have you tried measuring flow rates at all? Maze2 seems to really start to drop off in performance at around 1 GPM on my setup, and that may be a hard flow to achieve with the eheim, multiple blocks, and 3/8" tubing.
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