Preface: Everything below is approximate for discussion/example reasons and only pertains to the R's 4+ link suspension. The X uses totally different rear suspension and does not work or react the same.
Camshaft? I always heard it was the crankshaft. Regardless, there is a 10" difference between the cam and the crank on the Talon and In either case, neither is accurate enough. Just an inch or two difference in vertical COG on the R will be the difference between an "Anti-Squat" above 100% or below 100% when the suspension is fully drooped. That means the difference between bucking and not bucking.
Preliminary work with the measurements and numbers and using different COG's, we are talking about fraction of inches in some of the geometry or an inch or two in the vertical COG that can cause different reactions like bucking. For instance, if you move the front trailing arm mount 1 inch down (or the front upper arm 1 inch up), and/or raise the COG a couple inches and/or limit the droop a couple inches, it may completely fix the bucking but makes the machine not as good at rock crawling.
The biggest dilemma for me is I like to do almost everything and the geometry that causes the bucking problem also helps propel the machine to go over large rocks when the suspension is extended during crawling. The forces under that circumstance are the opposite of what causes flipping backwards when accelerating. This is why the R is NOT known for flipping backwards (flipping forward is a different story).
It is a catch 22, you can't have it both ways. The geometry that makes a good desert racer over whoops is the exact opposite geometry that makes a good rock crawler.
If only I could make the suspension geometry adjustable for my different riding conditions. Hmm

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