I only have 1 trip under my belt for GT. I am by no means a GT expert but since you only have a few responses in a week, here is an opinion.
I personally stay away from the bigger than average(new/full) moon phases when planning a trip. I feel the moon has other influences for fish and ocean dwellers that include spawning, feeding, breeding, nighttime activity due to low light or bright light conditions. These all may have an effect on feeding. Some positive, some negative. I prefer to avoid them altogether. As my friend says, I like to take the evils out.
If given the choice I will avoid the full and new moon by at least 3 days on either side. They may make for extra currents and in some cases, maybe too much for normal feeding, which is what I find on my local reef species. If I had to say, I would stay more away from the Full moon than the New moon.
As far as tidal movement it goes by the rule of 12's for a normal 6 hour tide:
- 1st hour - 1/12 of the water moves
- 2nd hour - 2/12 of the water moves
- 3rd hour - 3/12....
- 4th hour - 3/12....
- 5th hour - 2/12....
- 6th hour - 1/12 of the water moves