First, looking Your picture I would also can tell that Your G. mollicoma is looking more like G. alticeps to me.
Second, I pay a deepest respect to Mr. West, but in this topic I believe much to the Uruguayan arachnologists who study the local fauna for a very long time (follow the links from the below link).
Alice. I do have a little reading for You, but unfortunately it is in Russian but using the on-line translator You can understand the talk, I hope.
So, here we go: http://tarantulas.tropica.ru/forum//index.php?showtopic=689
Hope this clear a bit for You the mess...