Clones straight to 12/12 question on nutes

So i've been trying to find the answer on my own for the last few weeks with no luck, and my plants are hating me for it. My first grow i had a veg cycle, so i used BC Grow. My second go around, i was taking my clones straight into 12/12, and being a novice, only used the BC Bloom straight from the go. Its six weeks into flowering and most of my broad leafs have gone yellow and shriveled up. (which i read happens @ the end of flowering) I'm growing Jack Frost, which is a 9 1/2 week flower time. So i'm assuming thats way to early. So after the rambling i have 2 questions....

Question 1: If i'm taking my clones straight to 12/12, for the first 3 weeks while they are getting their height, should i be using veg nutes? and then around week 4 change the bath to bloom nutes? Makes more sense to me now that i have been reading.

Question 2: Since its 6 weeks into flowering, and i have 3 1/2 weeks to go, can i change my bath out and add a little BC Grow(veg) to the flowering nutes in order to give some N back in the system? or is it to late and i should just ride out the grow.

1000hps
6.05ph
1000 ppm

I'm also starting to add MagiCal to my baths. New to this, and i'm using R/O water cuz my well sucks so bad. My R/O spits out 40ppm water.

Any help or direction would be greatly appreciated

What's up ZTech !?
Regardless of what method you decide you run with your clones, I'd most def run veg nutes until week 4 of bloom with a 9 week strain.
In all honesty, it's hard to give a fair answer to #2 without pics.
People have different perceptions when picturing a description.

Since my bath was only at 700 ppm, and needed a couple of gallons of water, I added 80ml of bc grow to the 3 gallons of RO water and filled my res back up. I know I read not to add nutes to pre existing baths, but the need N bad. Was that my best case solution? Il add pics when I get to a computer.

I always add nutes to my pre existing Res, I just try to even everything out. I only change when 1)Transition 2) Flower
I wouldn't go Full veg nutes while in flower. But you could add a bit more than what the recommend during flower. just keep your PPM and PH in check. 6.05 is a touch high, it is still in range but 5.8 is perfect. A little change in 6.05 and you will get nute lockout and then you have a week or so of lost nute uptake.
Good Luck.