I think I may know what's the matter with the L1/R2 clicks - all buttons on the sixaxis are analog. It may well be that they are reading them in analog mode and picked a threshold so that if you just accidentally tap a button nothing happens, so you have to press the buttons a bit more firm. Could you try and see if that helps?
OK, I'll give it a go tonight.
Yes €40 for the clip-on is to much, I got my from amazon.uk a while ago for less, it´s £19.95 there right now, which is not that bad.