I chum the area with corn and then fish with a hair rig and a #8 hook. you really dont need a hook as big as a # 4. try chumming with a pack bait also. there are a million recipies if you google them. you could also try different flavor boilies. the strawberry or tutti fruitti work well for me. fish them on a hair rig also. carp take up most of my fishing time. I like to fish for big powerfull fish and they are the answer. I like to fish for them with my flyrod the most, but I do fish regular gear as well. I am really into carp fishing and the more you learn about them and the gear for them it is fasinating. there are several companies that make carp gear and hooks meant for carp. I use #10 hooks alot made by midday or miday I'm not sure, but they are super strong and lazer sharp. even though I have and have fished every flavor boilie there is, corn on a hair rig has been my top producer by far.
Joe
Joe