I too am wondering about this. I just bought an '06 and felt like the brakes had a bubble in them when I bought it. My old '98 Oldsmobile van I did many brake jobs on and its brakes even now at 200k are high and a hard pedal.
That TSB seems pretty complicated, and would be $$ in a shop and from posts I've read does not seem to last as a solution. Some people pointed to braided brake lines and better pads, have not tried that direction, but after hearing grinding noises and experiencing some odd braking sensations I agree with one of the TSB's I saw on here where it indicated the possible problem was incorrectly formulated brake pad friction material. Saw a Speed channel show about brakes and they are made from a mix of materials. I had a set with my Olds that was off, lots of grinding noises and poor performance. Its happens. Thank gosh for lifetime warranties, I think I've had 4 replacements at autozone for the original price! Thats what you get driving a POS into the ground I guess...LOL
I'm planning some brake work on mine, doing what you did but maybe spring for braided lines and make sure fluid is flushed. see if that helps.