Leaves Yellowing and plants dying thinning out first ever!

Hi

I have been doing this for years and have had an absolute nightmare lately. On the plants Im seeing the leaves go yellow. It started on one plant then spread to the rest.
1. Yellowing started at the bottom about 3 weeks into the bloom cycle.
2. Spread throughout the plants slowly.
3. Was treated with Fongarid (drench) which brought one back sort of but now its stunted behind the other one good plant.
4. One plant seems to have decided to give up all together and isnt growing any bigger buds just wilting going brown and dying.
5. I have treated with with Epsom Salts, Clean water Flush, Fongarid Drench and added to my latest cycle of water. I have also sprayed the leaves with clean water foliarly.

I have never had this much trouble ever in over 20 years and I cant seem to fix it.
Nutes are Canna Coco in Grown, DM Advance Gold in Bloom with DM Potash, Part A to stop growth and some "sticky" because it was free and I wanted to see what it did. ( note: on one plant it showed amazing results.

Strains are allegedly grown from seed outdoor then transplanted indoor, White Widow and Pineapple Crush.
Room is running 6x 600w and 2x 400w with excellent ventilation. Temps got a bit high on a couple of occasions 39c!! but seem to be hovering about the 26-29c mark consistently.
 

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