question on when to harvest my outdoor blue dream monster.

Some of the colas have 30-40% Amber trichomes, what I am looking for, but other colas are pure milky with no Amber. Can anyone share some knowledge with me about this phenomenon?

Usually the lower parts of the plant will mature slightly slower that the upper parts that are directly getting all the sunlight. Chop the mature parts and left the lowers keep going for another week

The strange thing is the opposite is happening. The lower branches are matured. I have heard chopping some of the plant will shock it and delay the ripening process for the rest of the plant. Is this a myth?

That's something that everyone will have a different opinion on here. But most big time growers will harvest in increments so I would think it's safe.

As for the bottom maturing before the top... It could be something to do with nutrients as they hit the lower parts first on their way of the plant

It is super cropped and the sun here rides the southern horizon. this lower section is on the southSide. I just realized this now. Thanks for the advice, I will harvest in increments