*PICS* Plants Might Not Make It Through Flowering

First timer with three plants grown indoors from bagseed in soil. They were started in a plastic cup and later transplanted into a pot with soil full of nutes. I held off for a month before applying ferts, but even in extremely diluted doses every time the plants get burned.

I waited too long to transplant them, until about 3 weeks into flowering. I (very carefully) transplanted them into bigger pots with topsoil that contains no nutes. Now they're about five weeks into flowering. Most of the lower branches have no leaves at all. I can't tell if the upper leaves are showing a deficiency or a toxicity. I don't know what to do!

Please help me save 'em!

PICS
3 Plants, 3 Photos

Water PH - 6.2
Run Off PH - 6.5
Temp - 25^C

The ones in the pictures are too far gone. Just harvest them.
What size pots were you using?

Those are the only plants I got and I think its too early to harvest them. There aren't a whole lot of the leaves left at this point and the veg stage ended long ago... I was just really hoping there would be a way to save them and ride out the flowering period for another 4 weeks or so.

They were 3-3.5 tall in pots that were maybe 1-1.5 gallons. The roots were literally overflowing from the pots when they were transplanted in flower.

I'm going to make a wild guess and say maybe the plants needed nutes (deficiency) but got burned when I fertilized the small pots due to the nutes being applied basically directly to the root mass? Maybe this accounts for the fact that they were being starved and getting burned?