Are low tension strings easier to fret than nickel plated round wounds?
low tension strings can be nickel plated... there's no bond between winding material and tension.
now, what you need are strings with low tension, so you have a bunch of ways:
1) setup. a proper setup is crucial, as already mentioned above my post. strings nearer to the frets are easy to press.
2) lowering the gauge: a lighter gauge (of the same brand/model) will be more flexible
3) using strings with roundcore instead of hexagonal core. the round core is flexible, so the same gauge seems lighter. for example Sunbeam/Hibeam from DR, Roundcore Boomers from GHS (they come in different gauges) or the mentioned Thomastik Jazz Round (coming in only one light gauge: 43-51-68-89)
4) using roundcore in a smaller gauge.
the only issue is that lighter strings vibrates more, and so they rattle with ease against the frets. it's important to control the right hand technique, lightening the touch. at the beginning is odd and can be hard, but after a few days it will be only a memory. it will be harder to go back to stiffer strings.
for a period I've used a 30-90 set, and it was awsome for the left hand: it felt like I wasn't touching the strings, zero effort or strenght needed, but for a week or so I had to getting the right hand used to them.
after that time, a 40-100 set of strings felt like the stiffest thing on earth!
they are wonderful for bendings and this kind of techiniques, because strings feel so smooth and soft!
I do prefer lighter strings, and keep using them (40-95 for roundcore, 30-90 for hex core). I sometimes choose big strings just to remind me of how they were, and to see if I'm missing something... ususally they don't last two weeks...