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The way it was explained to me was that you want to harvest before its more than 50% amber, as during the drying process the plant WILL continue to mature a little bit. The amber trichomes are indicators of degradation of the plant's quality. Much like you don't want to eat a banana with lots of brown spots because it is over ripe, you might not enjoy the smoke as much from the bud being over ripe.
And it depends on what other nutrients you are using on the plant right now. If you aren't feeding it anything then yes it will help. But if you already have a sleuth of nutes going in, then it might just be too much.