Yup...unplugged is about 90% of what you need to know.

rsp@odyssey.net
Bats, I too have a USACG Strat. Ours are very similar, except I went with Seymour Duncan rail humbuckers, and an original Floyd Rose trem with a locking nut. I have the Gibson Les Paul radius neck also. Gawd I love this guitar. Great sustain plugged in or not. Considering another build, but can't really imagine getting something better......just different.

Randy

i looked at warmoth for a long time....
have known about warmoth for decades.....
 
but after my experience with USACG i can say it is a better product.

I can say Warmoth is better. 

yes, you can.
 
LOL
 
but i've had both side by side, together at once, and my experience told me that one sounded and felt better than the other...
it's only my opinion, i'm just putting it out there for what it's worth.
 
and i am unanimous in this
 

batsbrew
what i learned in my research on building a project guitar
 
 
 
 
now when we experimented with various pieces at hand, you could hear the difference in the overall sound of the guitar (plugged in or not) when switching the necks out with different bodies.
also, the necks that had vintage style truss rods (one of the reasons i went with the USACG necks over the warmoth necks) was another big 'aha'.
it seems that, the way the wood is cut, and how the truss rod was installed, made the biggest difference of all, over wood types and fingerboard selection...
i took a maple/rosewood warmoth neck, with a gibson conversion scale, the double expanding truss rod thingy (which really makes the neck heavier and somewhat dead sounding) and a/b'd it against my freshly minted USACG neck with rock maple neck and pau ferro fretboard, basically the same neck as the usacg, except for the truss rod and the fret wood.
 
 

If you are saying that the single rod truss-rod makes a big tonal difference than a double...you sure went out on a limb.
Maybe there has been somebody that has taken a single action neck apart, installed a double and put it back together but to base the claim by using different necks? - same type woods or not.
Of course there are many things about guitars that players may think make theirs have a special mojo...and that's a good thing and not something I would try to change their mind about but it's nice to know when one is going to spend time building or assembling one, what is really going to make the big difference for the money, time and effort spent.
What's next? Graphite rods kill tone? (which I would have had installed with a neck as thin as yours)
Stability and transfer of energy from the neck are very good things with many factors involved but IMO the weight and difference of the wood removed for a double action truss-rod is...choice- with the advantage of having more control of any movement with the double action the best.  
 
Difference of opinion is a good thing. Not something to argue about. I know yours and you know mine. Enough said.