Hi ,
It seems that the 6.1 exporter was only a help to avoid the twisted bone problem. The scale problem is even worst with the 6.1, as problems with bone sizes start to happen. Currently it only works if the export scale is 1.0; FBX 7.4 binary exporter is more correct in this matter, only the size change when playing the animation.
If you need a file to test, you can download the model of the twisted bone thread here:
https://dl.dropboxusercontent.com/u/7549551/Octopus.
Thanks.