> Issues generating random numbers - I ran 8M simulations on 8 cores, but because the random seed was forked, I actually only ran 1M simulations 8 times. (Easy enough to fix, but annoying.)

IIRC, even if you do your easy fix of giving the 8 threads different seeds, your results are not trustworthy since the parallell random number streams are likely to exhibit significant correlations. There's quite a bit of algorithm research behind quality PRNGs.