Half the number of NDS spokes means the dish tension is divided between less spokes effectively doubling the pull on each one, hence...more tension applied to each nipple meaning less likelyhood of a nipple loosening.
Reducing the gauge of the NDS spoke without reducing the spoke count or lacing pattern has little or no effect on the ratio between the two sides, it just means you can save a little bit of weight as the NDS spokes aren't working very hard anyway so why have the same cross section as the DS?
It's all about flange spacings, spoke count side to side and lacing patterns using either heads in or out to get the widest bracing angle with the minimum difference between the two flange distances from the hub centre.
mmmmmm? complicated stuff.
To the OP, I think you've done well to get that split of tension between the sides.
Something to remember though, is that when you get to a certain point the DS tension isn't so effective in pulling tension into the NDS, much above 100kgf and an extra 10 kgf won't make much difference at all.
I try to pull the dish into the wheel using the NDS nipples as late as possible in the build as it reduces the chance of rounding a nipple...not sure if it's in my head but that seems to give a little bit extra on the NDS.