With one exception I separate the lines and kites so I keep three sets of lines in my quiver: 20m, 25m, and 30m built out of the virtually
indestructible 600# yellow/ orange/ white "water" line.
Most of my flying is "scribbling" [look at your GPS track after a day in a park
]
around on city parks with low to medium interference from neighboring trees and structures.
I am afflicted with light turbulent wind so I tend to be flying BIG kites [more than 5 FB over 8m area that get flown regularly] and they go on the
30m lines most of the time for the wind window and wing turning area.
3m -7m kites usually fly on the 25m lines unless I am flying in gnat farts then they go on the 30m as well.
3m and under usually go on the 20m to cut down the line drag from the heavy line that I like to fly or I will break out an "old" set of Pansh or PL
lines for the lighter weight.
Hope that helps
NASA wings -1 to 12m [mostly KM4]
Foils -2 -12m [mostly PL & Pansh]
VTT Stinger on Midi's
Another day in Paradise...