Wow 5F! Long read..........A good read, and I "think" I'm in agreement with you.
I have several Muzzleloaders, .50, .54, .58, and a .66. I have chosen the .54 (GPR Flinter) for my Elk hunting based on several things, but one is the balance and ease of carry...for me.
The .58 cal, is an 1861 Colt Special....a CW type Musket, that I love to shoot, but not carry all day when I'm hunting. It seems to me to lack the grace, the "pointability", and balance of the GPR.
The .66 is a smoothbore, and I have somewhat limited my range to 50/60 yards when using it....which works great in some places, and is not so good in others.
On the other hand, this same rifle has all those characteristics that I favor in handling, and I believe that big old round ball would knock a Freight Train down, if I could hit it.
I have made myself a promise to shoot that smoothie more, and become more proficient with it this year. I hope to use that .66 for Elk this year.
Russ