It is quite simple. I gave you an example on how to do it with 2 different modelers.

Look. If you import an object into, we'll say Wings, without scaling it on import, the object will look small and harder to work on. If you export that same object back out of Wings without changing the export scale, it will be the same size as you started when you use it in poser. Nothing has been changed from one app to another.

We change the import scale for the modeler so we can work on a bigger version to see what we are doing and have better control. But, we export the object back to the original size using the equivalent scale % to do so. As I showed in my last post.

There is no issue in poser size, except how small it looks in the other apps. That is all you have to do is ask in whatever modeling app forum, what import export scales they use for poser .obj.