Hi
I live on the coast (southern NSW - Australia) and the minor / major times do work.
There are also other factors like: cloud cover, size of swell, incoming tide, location, skill.
Nearly every time, the fish come on the bite for an hour or so right on the best times.
I swear by it!
It's almost if they have a 'truce' in between times...
Maybe in a river (or lake) it's different.
Maybe the fish have to be more opportunistic. Who knows?
Why don't you start a logbook and tell us if it works?
PK (also an old man)