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new calipers aren't going to solve your issues.
Not that issue, but they might help and might make less noise.
I know you say mechanicals can >>>>>>> but have you tried a bb7?
Not sure. I've tried cable discs but generally shit ones. It's not that I don't believe they work, it's that I don't want cables on my bike now that I don't have to. No more fucking barrel adjusters, no cable breakages, not rusty inners, worn outers.
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If the noise is from pad rub, which you're getting because you've pumped the piston out to try and correct the lever throw issue then new calipers will do bugger all.
I can see your point re cables but just seems like you're trading one set of (relatively easily fixed) problems for another which are not so easily fixed.
Ive heard/read a lot about lever throw on Shimano drop bar discs but have never worked on them myself so I can but guess.
Seems like there's something wrong with the way Shimano have translated mtb levers into road ones.
I imagine the problem is at the lever as it's the bit that's different. Ergo, new calipers aren't going to solve your issues.
I know you say mechanicals can >>>>>>> but have you tried a bb7?