A quick cautionary tale...
If you decide you do eventually want to send the stuff off to Canon, you'll not regret it.
However, don't calibrate the lenses... calibrate the camera's AF to those lenses and let Canon do it for you.
I had a 20D with 75-300 when I started off and moved up to the 100-400 as a replacement. The effect was far from wondrous, OK the lens took some getting used to but I eventually sent the 20D, 100-400 and 17-85 all off to Canon (Elstree UK) for calibration, and they adjusted the body's AF to the lenses - the 75-300 hadn't been good enough to show up the slight error in the AF system but remember that all things can have a +/- 5% manufacturer's tolerance which when 2 things are that amount out at opposite ends of the scale, you can get a fair margin of error.
PS FWIW, I've not played with micro adjust.