Should be Exactly the same result regardless of string guage because you are NOT in this case measuring the amount of compensation required in addition to scale length.
No sir, a stiffer string should, with all other variables remaining constant, still need more compensation. As the results proved. That's why something as simple as changing string brands can often lead to complaints about intonation; various brands will have different wrap to core ratios, giving the strings different slightly different intonation requirements, despite the gauge being the same. Typically not a big deal on acoustic guitars, but get an electric guy who runs a lot of reverb or has fussy ears, and it will drive him to your door in a hurry.
Doesn't matter if the saddles in this rig are barrels or not, as in this case he's measuring the movement of the whole saddle, not the contact point. Chuck, if you know the thread count for the saddle adjustment screws, you could determine the exact distance changes just by counting the turns it takes. For example, a 10-32(32 tpi) screw would mean 32 turns to move it an inch, or, 1/32" per full turn, 1/64" per half turn, 1/128" per quarter turn, etc... Might be worth determining what the thread count is and making a note of it for future reference, as it will make tests very quickly and extremely precise.
Oh, and thanks for running the tests, Chuck!
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