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Example from tonight. T2 Tanker. Length 150m, took two minutes 31 seconds to move past the vertical line. This gave me a speed of 2 knots which seems very slow.
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I cannot in anyway figure out how you came to this with the RAOBF tool. You must be doing this technique wrong. Length is the most outer scale, time is along the distance scale against it. Speed is read from the inside scale on the movable ring at the upper-right red marker. (All red-markers on it rely on the inside edge of that moveable ring, NOT the outer edge as look suggestive with the alignment of the end of it.)
Can you show a screenshot of the actual RAOBF when you try this out the next time, and it fails? As you would come out at about 9.4 knots for 150m in 31 seconds.