Thank you for the explanation, Ken - I must reckon that it makes sense, although the way they chose to display those ranks still leaves me a bit baffled (by the way, I was checking the same table you linked me, hence my bemusement by the game's graphical choice).
However, to amend that and to make Waffen-SS collar tabs look like they should, I've made that little mod I was typing about in the OP. While I was at it, I've also remade the Luftwaffe ranks to look in the same style (plus a couple, small extras). I'm going to post it on the greenasjade site as soon as I register there, too.
Cheers!
Michael