Big thanks for your feedback. You're right, once "two times XReffed", it changes its behaviour. Our main developers will have to check that issue more in deep. We keep you posted.
Currently Forest Pack uses "World" rotation values. We'll evaluate the possibility of using "Local" coordinates, but let me mention, that it would need to be treated very carefully as it might bring unwanted effects and I'm not even sure, if that's something feasible maintaining the compatibility with previous versions and all actual features. Thanks for your comprehension.