i'll thread 3-4 up the snood (head hooked) then load the hook up with 5- 10 more (head hooked again). or instead of putting maddies up the snood try using half a black or king rag and tip of with a bunch of maddies.
i find that thin aberdeen blues are excellent for presenting maddies.
I find that the more the better, no matter what you are after, as there are times when a lot of smaller fish and crabs will easily pinch the worms off as they are only head hooked.
No bait is ever too big, I've had flounder around the 1lb mark smash up whole live peelers (the size of your fist) on a 3/0 hook while bass fishing in estuaries and open beaches.
The trick is too experiment and not be scared of overdoing it or unerdoing it.
For flounders on a size 1 or 2 hook start with 1 or 2 threaded right up through the body, then another two or three threaded about 1cm up and pushed up the snood, and then a good 5 or 6 head hooked dangling. For a size 6 or 4 hook about 5 maddies is right and for anything between a size 1 and 2/0 up to 15 or more worms. The larger hooks and baits works well when the se is more coloured as the fish will be relying on scent more than feeding by sight.. One more thing you could try is a couple of gemini or mustad fluroscent floating beads on the snood. It adds abit of colour attraction plus adds a bit of movement to the baits, on occasions this can work very well.