Nothing wrong with your methods I'm sure, but if the Carp don't respond, then they don't respond. Stay with what you know works. As Newt has said, Pack Baits are what seems to work for your Carp.
You could try using the boilie dough though (just don't boil them) and fish it like a paste. It will leak more flavour into the water but at the expense of longevity.
I think that float fishing book you've gotten will be invaluable to you and certainly extend your fishing repertoire. My favourite book, although slightly outdated, is 'Coarse Fishing by Tony Whieldon'.
Not being funny, but the very fact that it is outdated may suit your waters better as I don't believe they are as heavily pressured as our lakes and rivers. I may well be wrong though!
Good luck with the float fishing Jonathan.
Edited by Renrag39, 20 April 2011 - 05:19 AM.