we used to have non carp matches on our local and skimmers were the target, there was always 2 lines of approach, 1 was to bomb a few balls of groundbait laced with pellet/corn/mag and caster to the deck and fish it out, and 1 was to feed little and often to bring em to the surface and get em up inth water…
both these methods would attract carp though and when these turned up i found just stopping feeding alltogether and maybe restarting somewhere else kept the skimmers coming…
was allways hard work though unless you just happen to get a peg where the carp wouldnt go for some reason…