I also like Zyex mediums. I have the light tension on now but I find the open A and D to be kind of thuddy. I wanted a lower tension string to gradually build up my thumb callous, ...again
I go back and forth between Superflexibles and Zyex. The Superflexible G really sings in upper position arco but it can be a little volatile. If you end up getting Zyex, be patient. They take some time to settle down and they seem to sound better each time I pick up the bass.