I'll go back to the original post again, hopefully with some more valid input from my last 2 sessions.
The first of the 2 saw a very good result. I have a video of carp feeding on the margins, sadly too big to put up on here.
I found the carp feeding, definite so set up on them.
Rig was a basic short Multi-rig with a whittled down pop-up, to sink but slightly lighter than the hook, essentially critically balanced to the 'n'th' degree, and a proper running lead, slack line. The whole lot was put in a PVA bag, rig, lead, bait, a handful of pellets and chops.
It worked and produced a decent, hard earned carp.
The second trip was different, in that the conditions made fishing a slack line rather more difficult. A wind and tow pulling silkweed down the lake through my lines meant I had to tighten up, although my rod tips were well under water.
When fishing at such short range tight lines can make the carp wary of feeding on the spot. I have seen fish spook or eject baits on semi-fixed leads, which is why I have a preference for running leads and slack lines.