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swmlon
edscoble
Possibly leak?
Another way to make sure to reduce bubble is to put the cup on the levers, fill it with a bit of oil and start squeezing the brakes (don't need to do proper bleed), small bubble should start appearing the more you do thi.
Put the cover on the cup and you can shake the bike properly, bang a hammer on the bike stand to send vibration also.
The biggest issues sometimes it's not the bleeding, it can simply be the calipers, I swapped calipers on customers and my bikes and it usually make a big difference.