molasses is for soil, keep it out of your hydro system. Plants can't break down the sugar, the microbes in the soil (good and bad) do it.
As someone much more knowledgeable than me has said in the hydro forum many times (the guy with all the stickies): "The only living organism in a hydro op should be the plants."
And don't judge by the hairs, the only sure way to tell is by looking at the trichs under a magnifier. I got a 60x-100x one at the grow shop but you can get them at Radio Shack for like $10-$15. The trichs go from clear to cloudy to amber, 50/50 cloudy/amber is a good time to harvest.
~25% of the bud weight also comes in the last two weeks, hang in there!