I was certainly hoping that it was indeed a simple fact of the "hybrid experience" but Lexus seems a little worried about it. They keep calling in more "specialists" and various engineers. In fact, they just called me and they want to keep it until Monday because someone else wants to run some tests on it now.
Also, as I mentioned they did tell me I am not the first to have this problem. Frankly, I am willing to put up with a little "hybrid nuance" on say a $25K Pruius, but not on a $50K Lexus. For $50K it should be close to perfect. If not, I may just drop back to an Rx330 and wait until they get all the bugs out of this model.