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not sure, it could be. I've tried the bikeradar trick linked above and had another go at just putting the filled reservoir on top and pumping air out - seems stiffer now. I'll try some of my club mates' (shimano) levers this weekend to get a comparator
cozzzzzzzz-
https://www.bikeradar.com/features/give-any-hydraulic-brake-the-bleed-of-its-life/
did you do this with wheel in or with brake block? had the same issue and put it down to needing new pads but could be this too
lf
Are you sure it's not the normal travel you get with Shimano?