i was trying to work something on my own, but i canīt figured it out... lets say i want low action,

, what would help me more?
thick strings since they have (or so i believe) higher tension
or
thin strings since they need less "space" to vibrate?
and how tense can fat strings get? i dont want they with TOO much tension (i tried a set of fender flats that were just too hard to pluck in a confortable way....)
i was thinking os some standard rotosound swing strings... or something similar... just trying to figure out the gauge.... right now im using 100-80-60-40
what do you recomend?
thanks for helping me out