These are just some random comments, I'm pretty familiar with the LaBella 2001 MHT and Cantiga New Cristal Sets with and or without NT Alliance G.
Even though you're mostly concerned with the trebles, I've never been a big fan of the Cantiga basses - but things change. I like the big, bold basses but those are indeed harder on the left hand so I'm back to Cantigas and liking them, it's just a different thing, really easy on the left hand and they seem to lend themselves to more legato playing...maybe & intonation is on. I don't hate New Cristals & I actually like that G string, it was all just feeling a little too slinky on my guitar which has pretty low action so I've replaced the G with a NT Alliance. I don't necessarily love the sound or feel of it, but intonation is great with it and it's reassuring knowing that the middle of your guitar is relatively in tune. Certain chords in tunes which seemed out when I got to them are closer this way.
Trebles, so the New Cristals were a little too pingy and NT Cantigas & Augustine Imperials are a pretty popular combo on this site. Originally to me that combo felt too weird out of balance, the Cantigas are pretty low tension and the Imperials are pretty high...on paper that is, so I've got an Augustine Classic E, B, Alliance G and Cantigas on. I'm liking it, The Classics are a little stiffer but they sound good, not as bright as New Cristals and the thing intonates. I'll probably try Imperials again though since I bought a few sets but the Augustine Classic Trebles are a pretty good compromise with Cantigas, at least worth checking out I think.
That said, I like LaBella 2001s but as mentioned somewhere up above, I don't know about the listed tension thing, it's less than D'Addario EJ45s but they feel, play and sound larger than them...to me. It's got to be the larger diameters of them. I also think the slinkiness of the Cantigas will have an effect on how the trebles that are used with them feel. Okay, that was lengthy...GL!