My plant has been under 12/12 for around 11days now, and I can see her pistils

I last watered her yesterday morning when the light came on with 1.5L of rain water (PH7) over around 15mins. Today when I got home (about 9hours in) the leaves were back droopy again (not as bad as above, but noticeable). The temps were around 32C (89F) and the soil was quite dry. Is this too hot? Can I compensate by watering every morning (back down to 1Litre) instead of every 2 days?

I've also noticed that on most of the main stems going up, the top two fan leaf stems are starting to turn red. It looks like a fine shade at the moment (lots of red dots changing its colour). There is no red on the main stem, or any of the leaves, just theses top fan leaf stems. Is this normal? I've searched around and I have seen a lot of people say its normal late into flowering, or depending on genetics. But I've also seen charts like this which seem to point to a deficiency. Any ideas?

Thanks!