Hey, All! Long time no see!
I also always struggled getting my ASOSH when in the IRR. I would go to Recruiters' Office and NOSC but would be told "Sorry, you are not in our Chain of Command so I can't look you up." Since this sounded like a standard answer and they never even actually tried looking me up, I basically took it as them really saying "Sorry, what you are asking me to do is extra work, which I avoid."
Calling the NPC Service Center would result in them trying to transfer me to PERS-93 and either no answer or I would get disconnected.
The only way I was ever able to get my ASOSH was by directly calling PERS-93 and telling them I needed my ASOSH for my son's application for a Presidential Nomination for the Service Academies. The Presidential Nomination adds point to the application process if the parent of the applicant has a minimum number of Points, which I met (in part through all the discussion in these boards over the years!).
Once the Chief at PERS-93 heard that, all he requested was a fax number he could send my ASOSH to.
I got a signed ASOSH in 10 minutes!
In the end, my son got both Presidential and Congressional Nominations but did not get accepted by any of the Academies. He wound up getting an ROTC scholarship though just like his Old Man, except for the Air Farce, er, I mean Air Force.