I don't know personally but 197's sounds far too long, even for 4cross lace (7x to high flange)
I think the difference in spoke length on the rear hub is due to the hubs you're using normally being fitted to a bike with multi speed free wheel, therefore giving more spacing on the drive side to allow for that.
I'd try lacing them 3cross with 184's and see what happens
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Probably no help but somebody had to say something, good luck
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