I put in around 3kilos of soaked and boiled birdfood on 1 rod at the start of a 3 day session.

The other 2 rods were fished with a hookbait over just a PVA bag of crumbed boilies and ground Vitalin.
The rod that produced the fish was the birdfood baited rod.

Not saying it is the right way to go as it was the only carp caught between all the anglers on the lake.
Saying that, the lake is very rich in natural food, we regularly reel in bloodworm, patches of weed full of snails and other food.

The fish I can find on my waters have been fairly active since February, not eating too much and small amounts of particles & broken /crumbed baits has got a reaction.
Some have had lice.

Far too many variables to say on a forum... Size of venue, stocking density, depth, weather conditions, angling pressure, amount of overall bait going in, what's being caught by others, how the fish are behaving, can you get on ‘em, length of trip, what's permitted in the rules, just loads and loads and loads of factors... Only experience, prior knowledge built via time, and the ability to read the situation on the day can tell what's best to do on a particular venue... A good spring starting point is don't put much out.