Clear to milky trichomes is a more uppity high and more amber is a more couchlock high. Its all on your preference as to when to harvest. 45 days seems pretty early for me but i have no clue to what you are growing. haha. The only true way to find out when the best time to harvest is to experiment with the different stages and find which high is best for you. You have gone this far no need to jump the gun. Good luck