User blog comment:Hayashi H/Spring 2016 Event Guide/@comment-26373693-20160507050201/@comment-26486243-20160507085527

It's a slow fleet that sends you through A and C.

Having more drums and daihatsu increases H node probability, but that means insufficient ASW. At any rate, not only does it involve fighting at a higher risk due to flagship submarine and lower fuel, average S-rank rates are low; Easy H is 20%, relative to the 70-80% ranges of D and F. I wouldn't really advocate farming H.