For some reason, the w9 parameter affects the complexity of the cards.
0.4072, 1.1829, 3.1262, 15.4722, 7.2102, 0.5316, 1.0651, 0.0234, 1.6160, 0.1544, 1.0824, 1.9813, 0.0953, 0.2975, 2.2042, 0.2407, 2.9466, 0.5034, 0.6567
0.4072, 1.1829, 3.1262, 15.4722, 7.2102, 0.5316, 1.0651, 0.0234, 1.6160, 0.2544, 1.0824, 1.9813, 0.0953, 0.2975, 2.2042, 0.2407, 2.9466, 0.5034, 0.6567
It seems that other parameters unrelated to Difficulty also affect it.
0.4072, 1.1829, 3.1262, 15.4722, 7.2102, 0.5316, 1.0651, 0.0234, 1.6160, 0.1544, 1.2824, 1.9813, 0.0953, 0.2975, 2.2042, 0.2407, 2.9466, 0.5034, 0.6567
0.4072, 1.1829, 3.1262, 15.4722, 7.2102, 0.5316, 1.0651, 0.0234, 1.6160, 0.1544, 0.8824, 1.9813, 0.0953, 0.2975, 2.2042, 0.2407, 2.9466, 0.5034, 0.6567
Hmm, this only happens with some cards.