Should've mentioned
I'm not seeing many amber trichs. the sativa is almost completely cloudly with a few ambers while the others I'm not seeing much, if any amber.
What is the strain that you refer to as being sativa? Is is a real true sativa, as in not an sativa/indica cross or is it just predominantly sativa and if so what percentage of sativa is it?
If you have 5% to 10% light amber trichomes, the time to harvest is now. Amber is a sign of oxidized THC, THC that had degraded, broken down and has become CBN. Waiting for more amber is only a case of intentionally growing your plants past peak THC levels and intentionally throwing away THC to get more CBN.
CBN content increases as THC degrades. It is only mildly psychoactive and can cause "fuzzy head", drowsiness, disorientation and sleepiness in the smoker. Some people wrongly believe that to be a body stone or a couch-lock stone but a true body stone, a true couch-lock stone comes from high percentages of CBD, not oxidized, degraded THC that has transformed into increased levels of CBN.
If what you are calling a sativa is a real true 100% sativa, or even a cross that is like 90% or higher in sativa, then you would want to harvest when roughly 5% to 10% of the trichomes have turned cloudy. A true sativa, a pure sativa or one that is almost pure will reach peak THC levels when the trichomes are still clear but the only way to know the trichomes have maxed out when it comes to THC levels is to wait until a small percentage of them have begun to turn cloudy. Once you see that, the rest should be as ready as they will ever be.