I really don't know where you get your information, but bows do not cause passthroughs. All a bow, any bow, does is launch an arrow at a certain speed. That being said, the BK is probably one of the fastest bows ever made. Once the arrow is released it's the job of the broadhead together with good arrow flight that determines penetration. Of course, shot placement enters into it, too.

If you do some homework you'll also find that Golden Eagle is not even manufactured any more so I wouldn't look for too many improvements to their bows, at least not from the manufacturing side.