popular belief is milky white trich's produce more of an upper head/sativa effect with amber leaning to a more indica/body/all over effect. I personally chop when the preponderance of trich's are milky white and juuuuuuuuuuuuuust starting to show some amber. I would suggest chopping earlier...
how much light? got some air circulating in there? what's your room/res temps?
are you adding your nutes directly to the res? the GH 3 part advises that any fornicating between the micro and other two nute formula's (mixing them together full strength) prior to splash down will cause all sorts...