The ratio between the left and right side tensions is determined by the hub. It's exactly equal to ratio of the sines of the bracing angles. The beauty is that this is (almost*) exactly equal to the ratio of hub's CTF distances.
So, your numbers are off, and the ratios should be closer to 40:60. I suspect that you're failing to use the correct conversions (specific to the corresponding spoke gauges) for your tension meter.
Leave the wheel alone and check your paperwork.
**the spokes don't go to the centerline, so adjust the numbers to account for the offset of the rim's spoke holes.
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