My Goldilocks string story...I have an Upton Standard Laminate and started by using Spiro Mittels six years ago. Great string to have as a base-line (pun?) for tone and volume. Been wanting something easier on the hands.
Tried the Evah med, too stiff. Evah lights, just a bit lighter than the Spiro Mittels. Tone was meh. Both gone.
Obligatos, (D/G over the Mittels)...nice soft feel and warmer tone...but too quiet... They vanish next to the Spiros in a live mix.
Now using a full set of Zyex Medium and they seem "just right". Have read that the tension is similar or just a bit more that Spiro Weichs so they are easy on the hands. The have a warmer pizz with some nice bounce on the front on the note. Have not had them on a gig yet, but at home they seem to amplify very well. They have a clear note center, so "my intonation suddenly got worse".
They bow ok, but I do not. The Mittels seemed easier under the bow to me.
Over all I like the Zyex best of all...for now. I would like to try the new Pirasto Slaps and/or Velvet Animas at some point.
Best of luck!
=JR=