I am very happy to "indulge" you with your "research project." Thank you for the assistance.
I had noticed the absence on any of the websites of any Kushro II drachms bearing the H mint abbreviation, but chalked that up to the randomness of hoard finds. After looking at some of the coin links that you found, I am reverting back to my initial interpretation of the mint abbreviation as WH = Veh-Ardashir.
In light of Daryaee, I have also narrowed the range of possible years of issue.
I have incorporated your information into my attribution of the coin in my gallery: http://www.forumancientcoins.com/gallery/displayimage.php?pos=-150961
As you can see, I gave you credit for your assistance in attributing the coin, with a link to this discussion. If you find the time to further research the date signature I will again update the attribution in my gallery.
Sasanian numismatics can be more challenging for the uninitiated than many other areas of ancient/medieval coin collecting.