I agree with comfortablynumbs earlier post of flushing and starting over. Dark and rust spots and chlorophyll bleeding in the leaves is signs of phosphorus, potassium possibly cal,mag deficiency which is commonly seen in flower.
Thats not to say it isn't there in the soil. You could have lockout from all the things these guys listed causing the deficiency signs.
Couple things I know about FF products, their consistency in quality control is lacking.
Happy Frog already has almost nothing in it and I've seen ocean forest be depleted in 30 days. The only thing I use any of them for is seedlings or compost fill if the price is right.
Tiger bloom is a touchy one. In my opinion its way hotter than they advertise. I only use it 1 time 2 weeks before flower to give them a little bump before my 2,8,4 top dress kicks in. I only use 1/4 dose and you can still see sativa leaning strains don't like it.
You said your tap is 50ppm. That makes me wonder if you have some sort of water filtration on your house with a water softener. That will cause salt build up quickly.
Your at week 2 of the stretch, after 2 more weeks its realy not going to matter what you fan leaves are doing but you want to make sure you soil is balanced for your flower growth.
So if it was me I would flush it. Start back out with the cal mag or dolomite and compost tea of worm castings, kelp meal, down to earth 4-8-4 or gia 2-8-4 with black strap molasses and call it good.