That's what testing has shown on out and my friend.
When the trichomes start to Amber this is when we see the CBD % drop and more CBN and CBG is found
Please let us know how you get on mate and when you harvest
I did a small test this year and tested the flowers from our DinaMed Auto CBD.
Day 56 the CBD % was 11%
Day 63 the CBD % was 12.5%
Day 70 the CBD % was 13.3%(harvested 90% of the plant left 10%)
Day 77 the CBD % fell to 12.7%
And 1 final week to
Day 84 the CBD % fell to just 10.3% (This was 30-40% Amber)
Hope that helps a little?
All the best
Mark..