The only thing I've always assumed is that you like posing your valks in gerwalk mode because you always mention it. Apart from the fact that you seem to have issues with the ankle joints of your 19's I have no idea how they stay or whether you like pointing their noses towards the ground or not. Gerwalk mode isn't my favorite one so although the ankle joints of my 19's are also quite weak I don't care very much, but I think I still can express my opinion on the subject and share my way to overcome the problem along with some pictures to illustrate it.