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Exact cable pull differs between different cable discs differs slightly, but as long as you're using a road caliper with road levers you should be more or less fine. What callipers are you using?
Ed is right though, compression less housing should help, the goodridge stuff is cheap on chain reaction or TRP do a kit.
Also I've never heard of disc specific levers for cable discs on drop bars...
You need compressionless housing to make it less sloppy.