In studio you have to bake the aniblocks to key frame, this may be why the BVH export isn't working for you. Right click the aniblock line to get the option to bake to key frames.

Yes you will have key frames to edit, but there are a lot of them, as in a continues line.

Aniblock import is part of C8.5.

Animate 2 is the app/plugin for building and editing aniblocks in Studio. A necessity when using genesis g2 because aniblocks are made for mil4 figures.

Like I've said before Studio is an excellent helper app for Carrara, it shouldn't need to be but the further DAZ develops carrara{lol} the more necessary it is.