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@snottyotter
Shimano free stroke doesn't really do anything. Initial problem sounds like sticky pistons, especially if the not returning kinda feels like it "stacks" like the more you pump it the less it returns or it returns very slowly. Not returning at all consistently could be a problem in the lever, a seal blown or something, I've not stripped one down to repair but might be worth it if you're not paying someone workshop rates to try. Fluid not passing at all could be the same thing if it's a seal or something like the common problem with SRAM guides, or maybe a new problem introduced with the new hose, worth checking.