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That's a bit weird then; assuming the rim's not an offset one, you'd expect the tensions to be equal once it's central. I've heard of people using thin threadlock on the spoke side of the nipples and letting it wick up the threads, but I don't know how well that works if you've oiled the threads to help the wheel build in the first place.
(As an aside, I'm not entirely convinced heavyweight spokes are necessary for a cargo bike; if you look at the tensile strength of spoke steel, standard 14/15 gauge spokes can crank up to rim-breaking tensions without going anywhere near yield stress.)
Thrustvector-
but I don't know how well that works if you've oiled the threads to help the wheel build in the first place.
The idea of spoke prep or boiled linseed oil is that it's a lubricant during the build, then locks everything in place some time later. You'll get many opinions about whether that's a good thing or not.
Did you prestress the wheel? It sounds like spoke windup to me (with a bit of under-tensioning thrown in), though odd it should happen just to the drive-side on a equally tensioned wheel.
Jon.
Spoke tension was around 27 on my guage. Chart measured spokes in mm so wasn't an exact match. They are pretty chunky spokes & I used an 11g spoke key.
@Thrustvector it's an Enviolo (Nuvinci) hub, dunno rims & 36 spokes.
I should point out that the wheel/spokes were fine for first year & I've only done about 20miles since I rebuilt the wheel. I kind of expect a bit of trueing after a few miles, but these spokes had just rattled loose.
Can one use some type of threadlock after greasing/lacing/trueing a wheel?