I just added the outer dog and the 20" light bar, which is how I like it. I likely do more limbing and less bucking than you, so our needs are different.
This saw pulls so well I felt it needed the outer dog, but other than that I wanted to keep it as light as possible … keeping with this saw's attributes.
I noticed that in the tough White Oak cant the stock 572 and 462 were very close. I figure my muffle mod gives me a bit extra … makes for a nice power/weight package, and Mark said my saw felt more "responsive" than stock, so my minor muffler mod did not detract from the crisp throttle response