No doubt they have worked and probably less meat damage...but I wouldn't know. I just started looking deeply at my harvest this year beyond the entry and exit wound. The mono tends to loose a shoulder on one side on my broadside shots with pretty bad blood shot.You might not want to use them but it does sound like they are working well for you. Probably less meat damage too.
I think I would still prefer a non mono and bigger wound channel. If the bullet stops mid or 3/4 in then therictically it would save the far shoulder. I am sure that has been figured out on this from some where and I would be curious.
We will be leaving CA in a few years and I will most likely start home loading and running different bullets.