Well, taking the instrument out of the equation, I think it's an endless spectrum of vol/tone/feel—with the obviously compromise of volume vs feel. At one end it's 'a cannon' at the other—it's 'easy in the hand'/flexible/supple. A great example is DR Rare vs GHS PPB
I would agree that the GHS PPB (and probably your best bet from your post) to have more perceived volume over TI JR, but in my case they (GHS) don't 'give'/feel under my hand as much—so thats my compromise. IME (though I still recommend you try them) TIJR will not get you any more
presence in an acoustic group setting or sound any more 'low register guitar'-like. If you're looking for that
tone in
low tension feel, I'd recommend trying either Dogal Hellborg (EB-steel/stranded core) or Fisoma F2716 (silver/nylon)—both feel like EB strings, ring louder than TIJR, and feel as flexible in the hand. *If either brand would make a flat/pressure/ground wound I might be done looking.
And TIJF are great. I loved/played them for over 20 yrs...
but they are not the sound (tone) I need for my ABG project. If you're looking for a darker flat sounding string (which it sounds like you're not) most of the Labella offerings go there. the lighter gauge 750 series is more flexible in the hand and the White series (Gold-Wht/copper-Wht/Wht) definitely sing more than the Black.
*Ive also tried the LaBElla GOLD flats (basically the LaB flat string in bronze metal) responses
a little better that TI JF acoustically, but they are stiffer than both TIJF & TIJR... so like life, endless series of compromises.
And with all that being said, knowing what you're looking for is key. IME just searching for a "louder string" is only part of the equation. I was shocked by DR Rare bronze, they were super loud on my Furch but not very nimble (and the wraps are noisy).
PS> all my observations are based on
acoustic settings. (Any amplified evaluation is more about the pup and amp, and easily tailored to needs with eq.)
Hope it helps