Weapons 130 and 131 have the wrong penetrations. Both should be 18 not 12 and 15 This can be corroberated at many web sites. Heres one
http://www.inert-ord.net/rod02h/stielgr/index.html
This site also gives the stielgranate41 an effective range of 6 hexes you have it at 4.
The Book The History of the Panzerjäger: Volume 1: Origins and Evolution 1939–42 by Thomas Anderson talking about the tactical deployment of the weapon says
it is important to keep the stielgranate(41) well hidden until the target comes within 300m.
stielgranate41 and 42 have the same warhead just different adaptor on the back for the different guns.
There is a good discussion of both munitions here.
http://theminiaturespage.com/boards/msg.mv?id=305973
Note the issue dates given in the link differ from those in the game. They are feb 42 for the stielgranate41 and Mar43 for stielgranate42 you have 6/42 for both.
Also these are AT guns units 712 and 713, they would still have their normal AT and HE allocations as well as a few stielgranate shells. Can the AP and HE shells be included in the weapon slots of these units instead of SMGs and Gebalt ladungs?
The Book Small arms, artillery and special weapons of the Third Reich by Gander and Chamberlan mentions that Unit 9 Flak 36 also fires the Steilgranate41 as do weapons 24 4.7cm PaK 36(t) and the 3.7 PAK 37(t) the last I think is not in your OOB
The book has two very nice pictures of the stielgranate41 mounted on flak guns, so 3.7cm SP FLAK, units 324 and 483 probably also fire the munition. Introduction date would I think be the same as for the stielgranate41 for the 3.7cm PAK as it looks as though the flash hider is removed from the FLAK so the stielgranate can fit over the barrel which of course is the same diameter as the PAK the pictures look to be of a FLAK mounted on a vehicle though it is hard to make out exactly.
Note that there is also a stielgranate42 issued for the 150mm howitzer which appears to be an oversize thin skinned HE bomb packed with 60lbs of explosive giving a really massive blast effect out to about 1000 yds.