Dinafem Blue Widow - 1st Grow

Flower Week 6 5/16 For the first time I'm seeing some significant leaf issues. The enthusiastic feedings over the last few weeks have caught up to some of the plants and I'm seeing Ca/Mg deficiency and P and K excesses. I've set up a 20 gal reservoir with a variable speed pump to feed these beasties so I'll be cutting back on the bloom nutes and adding the max recommended Ca/Mg. The plants are still robust and putting on flower weight, but the leaves are telling the story. Plant 1 is well ahead of the other 4 in terms of stretch and bud development. Plants 2,4, and 5 are all at about the same stage of development and plant 4 is the furthest behind, I've got the lights at 16 - 18" above the canopy but there's still not a major daily stretch. These Blue Widows are leisurely to say the least. The 2 Black D.O.G that just went into the tent are showing 1-2" a day of stretch ... not the Widows. I've sampled some of the trim from these and it's a fantastic uplifting high. Can't wait for the harvest. At this point it seems like it's just a matter of patience and keeping an eye on the trichomes. It looks like #1 will be the first to mature with 2,4,and 5 about a week behind and 3 a week behind them.