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So I think I've confirmed that something is going wrong (possibly incorrect spoke lengths?).
Spoke lengths won't alter spoke tension. Build it up so the DS spokes are tight, and the NDS are tight enough to centre the rim. After that, there's nothing else you can do without changing parts. And there's no reason why those parts can't be built into a functioning wheel.
Brommers
@Ndeipi
@gbj_tester you beauty
The rim is non-offset. The spoke holes are not staggered.
The flange offsets from the spoke holes are 16.2 mm (DS) and 37.8 mm (NDS). That's a ratio of 2.33, i.e. DS spokes should be at 2.33x the tension of NDS spokes.
Square root of 2.33 is 1.53. Therefore DS spokes should ring at 1.53x the frequency of NDS spokes. But they currently ring at twice the frequency (an octave higher) and need to go higher still to correct the dishing.
So I think I've confirmed that something is going wrong (possibly incorrect spoke lengths?). What shall I change?