Yes, thats about right.
The best tide time depends completely on the beach/break. Some places work all the time, some are 'best' at certains times, and some only work at a certain tide.
But that 'certain' tide can be high. low, mid...
You need to get to know the break.
The other thing is the size of the waves often fluctuates depending on whether its on the way out or on the way in. When its on the 'push' (ie coming in) the waves will tend to be a little big bigger, which can make all the difference on a small day.
Putsborough is a classic for this - lovely waves as it comes in, then often goes almost flat as it goes out
