My tomatoes are dying :(

Hey guys, I got some tomatoes growing outside in a dutch bucket hydro setup.
Been growing like champions for weeks but then they started getting yellowish leaves and the smaller leaves drying up completely.
I checked the PH and EC, PH was fine but the EC was a too high.

So I flushed them out with PH 6 water with no nutes for about 30 mins and doubled up the water in the nute tank to dilute what was left.

Anyway 3 days later its just getting worse. Ive flushed again today until the EC reached about 4-6 on the return feed.
I also totally threw the water from the nutes tank and mixed up a weak mixture (EC 12) to see how they do over the next few days.

Does all this sound right??
I threw up some pics to show the leaves to see if that helps...

Cheers guys!

I'm not familiar with EC I use PPM but those dark green leaves look over nuted. (Unless where you are it is the fall season right now then they look mature) I imagine it's hard to keep nute levels from rising when doing hydro outside. Good luck hope to see some more pics!

probably to much crap put in soil, water and let sunshine do its thing. So many rituals for growing anyone ever here of the KISS principal ( Keep It Simple Stupid) not calling you stupid but put them in the ground prep soil prepare soil people don't over compensate for nature!!!

Tomatoes devour Calcium and Magnesium in fruit ...

Marigold are great flowers to plant with tomatoes to prevent pests! Good luck