The DH inherently grants the advantage to the AL in the Series. From pitchers, you're likely going to get a nearly equal amount of production (inherent NL edge, but they're still pitchers), but from DHs, there is a huge disparity, as it is ridiculous to pay someone to be on your roster just to play 3/4 games that are by no means guaranteed.
Make the system homogeneous; either institute it in the NL or abolish it entirely.
Like I said, MLB has 1 offseason to prove it isn't a joke. The onus probandi is on them.