frist time auto grower in need of hlp plz guys

Hey guys, I've uploaded these pics in hope I could get some feed back as im a first time auto grower but not new to growing. I'll start by telling you what they are and how they been growing, the 3 are purple cheese fem autos and when I read up about them they are crossed between a #1 low rider and #1 cheese something, cant remember what it was. They sprouted within afew days of one an other, first one on the 28th june and the last one on the 30th june. From the pics with the 3 plants in pics 5,6,7 the first 4 pics are of the plant in the square pot and pics 8,9, also the top got cut off this plant by accident and now there are two tops, super crooped it lol. the middle plant in the round pot lol Feeding: ive only feed these plants 3 times with low amounts of nutes as the strain dose well on low nutes from what it read about them, ready in 60-80 days it also said. I had to transplant them all as the pots I had them in before were only 7" pots as I knew autos didn't grow that big but two of mine did plus these two are a lot behind the little 1 in the square pot which buds are in the pics 1-4 and 10-12 which also look good apart from that brownish on the leafs plus they were too close to the light and cupped but its now a good way from the light which is a 600w hps with its ballast. I water them every other day and when watering I water them over the space of 2 hrs, ill add some water, then go off and do something then repeat it until alitte water comes out the bottom of the pots. I added some worm castings yesterday as a top dressing and that's really all ive done, from the pics would you all think they are growing ok and can you see anything wrong, I think there a little mg def going on but not too sure? All feed back will be real grateful, before I go im using water that sits in an open container for 2 days then I ph it to 6.7 and water/feed, should I need calmag with the water? my water is moderately soft, from the water report it says that and also cac03 mg/l which is 75% ca mg/l would this need calmag? thanks for reading guys scunk

I've just taken a reading of the run off and its at 5.3 which I don't understand why as all my water is ph'd to 6.8 before I even consider watering or putting a feed together, I haven't any dolomite lime or hydrated lime, only thing ive got is garden lime which is a fine powder. With my ph this way I am just woundering what I can use to get my ph back up to 6.4-6.8? Be so grateful if someone is able to help me sort this out. thanks guys

If i water from the bottom will that raise my ph?

Come on guys i cant believe that theres no one on here who has any info to share.

can anyone help with what they think is startting to happen with these leafs?

Yeah, I can tell you what is happening to those leafs, they're turning yellow which is nothing to worry about. It's the bud that counts and that looks ok. I grow kick ass bud and never worry about what the ph of my soil is. When Feeding I make sure the ph is 6.8 after that I don't check the ph.

ya they start screaming for nutes that they really dont need later in flower
a cal/mag issue cannot be remedied this far into flower by the time you fixed it you would be flushing
at this point in flower if the fans are starting to yellow this just means that the plants are a few weeks from harvest

thanks guys really really thankful for the info, this is the frist grow ive got this far with and would love to smoke some of my own grow and im sure you know where im coming from there. When we watch something grow and worry over it its a grate feeling once you've finished it. Again thanks scunk