Good talk on balancing here, there is a lot to be learned for many of us so will share a bit. Balancing is certainly not all created equal and it is most often done with subpar equipment. Of course the very nice equipment that actually works, perfectly every time, is simply very expensive. The VSR is a requirement, simply mandatory; and having your own is the only really way to ensure the job is getting is done correctly. We learned this the hard way and thus took delivery of our own VSR in 2014; and thereafter found it is a delicate procedure, in many ways an art form, that really requires much time to get to a level of perfection that can not be mechanically bested. This time taken comes at a premium when attempting to outsource the VSR function, meaning typically a VSR operator attempting to meet a timeline (aka production quota) is simply not going to take the time to achieve the best possible mechanical results.
Component balancing is still something that is under rated too, as most of the available (and "affordable") component balancers do not do the best job possible either. On that note late last year we finally dumped our old component balancer, a very standard unit that most in the industry utilize, and stepped up to the Schenck TB Comfort.
This Schenck component balancer is lightyears ahead of the other archaic equipment that most shops use, in some cases as their main balancer from component to entire assembly balancing. We've been there and done that and the results are very often mixed and certainly not consistently perfect. In fact perfection is more of a rarity and achieving a flatlined .1g dynamically across the rotor RPM operation range would be literally one in a million (without having the VSR). Achieving what is thought to be the acceptable limits (ie. less than 1.5g) is certainly achievable, but what is thought to be acceptable and what is perfect (ie. OEM-like) are two VERY wildly different things.
Anyway once you get the component balancing part down with component balancing equipment that actually works very well, yes, ABSOLUTELY VSR balance the entire assembly EVERY TIME. This is the ONLY way you can get a guaranteed perfectly functioning CHRA with true modern-day OEM dynamic balancing characteristics and it is proven via a dynamic vibration level printout.