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I wrote a simulation, with some interesting results
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the measured rtt is stable, it converges quickly
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call the denominator for the ack delay calc. D, as in min(rtt/D, 150)
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call the "real" rtt RRTT
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for large D e.g. 8, measured RTT -> RRTT + RRTT/D
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for small D e.g. 2, measured RTT -> RRTT + 2 * RRTT/D
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i.e. measured RTT is twice the real RTT for D = 2