Lunar, those cool night's you been having, has help make your buds a pretty color, thats pretty.
Yeah, if your buds are still swelling, they are not ready yet. Give them some more time.
Yes, you can give them 2-3grams of MegaCrop, that's good stuff, a couple of more times, then just water and molasses all the way to harvest.
That MegaCrop has Nitrogen in it, but a 2-3 grams ain't gonna hurt nothin, plus they need a little nitrogen in flower .
3-4ml of Cal-mag, ain't gonna hurt nothin either.
Your doing a good job, with your plants ,I just hope the cold weather, stays away, so you can make it to harvest.
Later.
Next grow start you a journal, from the start.