Take a geez, Am i on the right track to recovery?

Howdy howdy

1st grow. did it for a bit of fun.

germed 1 seed (all i had at the time)

then another 2 1 week later.

did 2 in jiffy peats then into rockwool and 1 into just plain rw.

all have since been transferred about 2 weeks ago to hydroton after i could see roots showing.

started adding light strenght growrite a&b
ec.6

last week got a 600w hps and placed that in. changed res to ec .1.

Got some nute burn and alittle heat stress (im assuming)

res ec slowly rises as does the ph.

topped res today brought ec down to .8
topped up some ph down. took it down to ph 5.9

lifted the hps up a few inches.

Hopefully this will solve my prob?

LEFT: Week later seed:Jiffy/RW/Hydroton
Middle: first seed: jiffy/RW/Hydoton
Right: Week later seed: RW/Hydroton

here are some pics

in the case of yours (and i also got a little nute burn (mild) on my seedlings) how long if anyone knows would a change in the system be noticed? as in 1 day or a week to see improvements...

Well i quickly gave them a bit of a flusher and redid the res completely.

I think its stopped it from getting any worse at the rate it was getting...

UPDATE:
PH 5.9
EC:.2 (due to ph down solution)

Fingers crossed hope they recover and dont get worse