I would say helps on a cloudy full moon as the fish have adapted to night feeding but have to day feed when cloudy.........
The opposite would occur if it was a clear night...my 02$

Troy,

If you think about it, you answer your own question....If they were tossing bait fish, you probably want to use minnows of some sort. I usually attribute these times to just not getting it right that day.
  Everything I have read, heard, etc is 3 days before and 3 days after the full moon is the best fishing, if you note in the various magazines that have lunar/astro tables they always identify best fishing within these times.
I saw a study of all the world record fish caught, ( all species) and the vast majority were caught  in this window. I belive it was J. Henshalls book of black bass but don't quote me on that. The article showed  probably 85% of the world record fish caught in and around full moons.

Some more evidence... how many large tournaments are in this window..... for a reason I suspect.

As far as whether they are too full, keep in mind that feeding is only one of several reasons bass bite. Roland Martin claims the following 8 other reasons, Reflex Actions, anger, protective instinct, curiosity, competition, territorial instinct, killer instinct, and ingnorance. Buy them all if you like but I feel pretty certain it isn't just cause their feeding, and I would question if a a bass ever gets full.

Interesting topic though.... To support your contention, I was once up at LakeCushman  right after a hatch of some bug that was like a carpet on the lake... I fished for about 4 hours without a trout bite, even once.