I use a bottom bait with fake corn most of the time in the colder months and it has caught me many carp over the last couple of years so I have 100% confidence in it.
Sometimes I get a peg that may have a bit of weed or chod at the bottom which can sometimes result in me reeling in to find a strand of black weed on the hook or bait which puts the fish off taking the bait.
If casting around the peg I find the bottoms no cleaner elsewhere, I then start to wonder what kind of rubbish I'm fishing over. Its on these occasions I would like to pop the bait up just and inch or two to keep the hook and bait clean.
I did have this sittuation the other day and used a double floating corn weighted down with a split shot. I just wondered if the shot was causing a weak spot maybe on the hook length. The rig did produce one carp for me, a cracking 14lb common. It's proved to me that it works I just wondered if I could refine and improve the rig somewhat.
The KD rig has a proven track record for catching fish, but the set up sounds very much like fishing a wafter and with so many wafters/critically balanced wafters etc. on the market these days would they not be a better option than having a shot on the hair? Just a thought.