Last week to harvest...Please help

I have a few questions....I am using co2..should I shut off 2 weeks prior ( I read something about that)...I am into week 9 on a 70 day plant. My trichomes are milky with very few amber and I thought they would be more amber by now. What temp should room be? When I do my 3 day flush I was going to top off and still let bottom buds turn or will they all turn at same time?...when I do my 3 day flush should I use new water daily or use same water for 3 days? Any info would be great...​
 
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