I am not disputing anything a good player is a good player no matter where you put the congestion control.
Play on 70% and you will do just fine, put it on 20% again you will do fine.
People are looking at your game play and other users game play and thinking its the % or the hard throttle it is not, it is the players tactics and reactions combined with their ISP connection non of which can be transferred by a setting apart from a close host and the reduction of local congestion by the duma.
Whilst what you're saying holds validity, connection is king in COD, it will always be.
When BO3 first dropped, I throttled my connection to get a one up on everyone, but that changed with hotfixes, so my games took a decline/fall for the worse. By the time the bigger patches arrived (i.e. 1.07) the game was terrible for me, rage inducing even.
I had to re-test my connection and how it worked, however it's the same connection, same game play style, my reactions have not changed for an older gamer and I use the same monitor still, if anything my eyes are worse than before as they're degrading sadly...
Whilst 97% won't be the "magic number" for everyone, hell, it may not help anyone other than myself, the number isn't most important, the bufferbloat under some load was and for me that was 97% but I specified that already.
The important aspect to consider here may possibly be the PFiFo/Hyper-Traffic settings. It's no secret I've been reading, reading and reading some more and I'm trying to mix up and incorporate what I learn at the rate I'm learning, for me it's changing this game and busting it wide open to my benefit.
Every COD plays almost exactly like this for me, with AW being slightly more stubborn.
Edit: BO3 has an update 1.10, I'm keen on seeing how my setup will hold up and if things will suffer or not.