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I did some tests using ENT, which showed a significant improvement in serial correlation if you rotate Rand8 and Rand16 in opposite directions (like you do). Which is no surprise because the return value XORs both values (though, the higher the value for the XOR value, the less relevant this becomes; especially $eb and $fc are even slightly better without reversing the direction; I guess the number of high bits set plays a role here). I also tested all possible values for XOR ($9c, $b4, $bd, $ca, $eb, $fc) and especially $9c gave good results for all tests (especially chi square).