I have been fishing balcombe for some while now and as you said it is very hit and miss, as soon as you find an area or technique that is catching i wouldn't change it unless the fish stop feeding off that particular bait (what shouldn't really happen). I have always found that using a single bait on the hair works a treat with around a handful of lose feed around the chosen area.
this technique has worked wonders for me and a friend which has resulted in us catching 20+ carp between us. the nuisance fish can be a bit of a problem using this method but stick with it. avoid using particles as you will get the bream and tench stuck in your area mopping up for some time.
biggest to date i know of is 27lb common
hope this helps and tight lines