Cant quite nail the problem any ideas

Slowly getting more and more yellow leaves bottom of plant looks bad top looks fine month into flowering

Watering issues? What grow medium and how often you watering? Environmentalcconditions? Could be heat too.

Watering once every second day about 2 litres using potting mix with a bit of compost and some trace elements magnesium sulfate blood and bone and dolimite lime mixed in maximum temp would be 30c got a nice breeze blowing over them plenty of air flow

Unless you're doing hydro, you shouldn't have a set water schedule. That temp is kinda high. I try to stay below 75f as a high. Lowest 68f. Fan blowing slightly not too strong, also, your tips are starting to burn, maybe a hot mix? On that first pic, thats larf. Clean it out around 2-3 weeks(max) into flower. They will stretch, you must visualize the tops development at the end of flower.

light source?

do you think its to late to trim it or still ok? My fan is on its lowest setting i dont think its blowing to strong by hot mix to you mean to much nutes maybe i just started adding some liqiud lead maybe i should give it straight water next time i dont have a fixed watering schedule as such it just seems to be that every second say i find its dry enough to water once or twice ive left it for the 3rd day when the weathers been a bit cooler and the light source is hps sodium bulbs

Let soil dry out. Then just water with ph water. She hopefully will recover

TBH, all that little stuff in the first pic aint gonna be preemo nugs, so clean it out. Little by little, all at once? I don't want to fuck up ur plants more. I go with my gut. I agree, the tops are awesome! Id concentrate the energy of flowering to those delicious tops.

thanks all ill give that a try see how it turns out

That looks like way too much fertilizer and now it is yellowing and dying off. Maybe leech out the pots with fresh water and hope the roots stop burning.

And the hotter the room the more the plants transpire and take up even more nutes.