I just tried the 2:2:100 dilution over the weekend, and it worked out pretty well for me over 1:2:100 (for alt processes).
By the way, I just noticed you can buy Pyrocat-HD kits from Photographers' Formulary, if you don't like mixing it yourself (which is really easy, by the way). http://www.photoformulary.com/filmdev.htm
$11.95 USD for 10 L working solution (I'm guessing that's at a 1:1:100 dilution). I'd have to look at prices next time I need to buy chemicals, but I'm sure it's cheaper mixing it yourself.