Nick,
Great questions which I hadn't considered yet. Pfff well??? I suppose how they're feeding is going to be dependant on what type and quantity of offerings are down with the hookbait, how shy or aggressive they're feeding (that Vs. bait height). At the moment I only plan to pop baits up high enough to know the hook is clear of debris particularly along a tree-lined margin situation - twigs, leaves etc. If I'm scattering just boilies as freebies then (at a guess) I'd be expecting them to be cruising around picking them off (sucking).....I don't know now. My logical thoughts are gone for the day it's bed time!