Had a chance yesterday to try the new set up with the addition of the RRS clamp in the field after more than a month nursing my wife back to health from her illness.
Lessons learned and other observations:
1) The RRS clamp started twisting off of the Sirui plate after carrying the monopod on my shoulder for more than an hour. Fortunately, both the RRS clamp and the Sirui plate each has 3 1/4-20" threads, so I simply added another male thread to join them upon returning home. I don't think I'd need the third to keep them from twisting off. As far as being able to take it off quickly from the monopod in order to free the camera for handheld action when needed, it's of course a whole lot faster than the knob action.
2) Once the tilt tension is totally loosened, don't let it go until it's retightened OR set its tension to prevent the sudden drop. I learned this a bit hard way. My camera suddenly hit my head when I let my hand off the tension adjusting knob in order to adjust the monopod height. It was more a surprise than pain. Oh, I'll get the hang of it.
3) Having a LensCoat cushion or a DIY insulation foam on the monopod grip portion is very handy for shoulder carrying. Even then, the shoulder started to hurt after awhile. The overall weight wasn't too bad, and I'm so glad that I went with this set up as opposed to a Gimbal sidekick idea which would have added a lot more weight. Both my shoulders taking turns solved the issue.
4) The tilt and pan action of the set up truly allowed me all the freedom of action necessary and so much more pleasurable to use. I tried using it with the pan motion disabled, and it's just not the same. I felt lot more conscious of the monopod as I have to physically move the monopod side to side. I also felt that the Gitzo monopod rubber foot won't last long -- either by wearing it out or lose it by constant turning motion. I'll probably swap it for a spike. When tilt and pan motion is in effect, I don't even notice that I'm using a monopod. I become oblivious to it, meaning my entire focus is on taking the photos rather than any part of my equipment.
5) Definitely more keepers, especially in windy condition as it was (can see that in the hawk photo below), using the monopod as opposed to handholding my 5DIII with Sigma 150-600C.
Here are just a couple from the outing:

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