I agree, a bit of air in makes it feel crap.
good bl;eeding is the key, i used to previously bleed my (Shimano Saint) brakes by squeezing tghe lever and catching the oil at the brake end, bu using a tube into a bucket, tightening the bleed nut between every squeeze. This worked fine but I too occasionally had problems, I then tried the syringe method, effectively sucking the oil through instead of pushing it from lever. This improved my brakes no end and now they feel great.
Burning them in is also recommended, but ideally you need a nice long steep hill and there arn't too many around here.
Andy
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