Hi Maresz,
   Your plants are looking very good.

Each leaf on the plant absorbs light energy,  to produce suger for the plant to grow.

They give the plant energy.

Therefore,  healthy leaves shoud never be removed from the plant,  and as each leaf is  producing energy for the plant to grow.

In order to transform the light of the sun into energy, however,  the leaf has to be healthy.

This is the deciding factor if a leaf is to be removed  from a plant.

If the leaf has large brown or brittle patches on it which are damaged or dead,
then it is not giving the plant much energy.
The damaged leaf, however, is blocking light and preventing it from striking healthy leaves.

In this case, I would remove the leaf,
especially when the plant is flowering as it needs lots of light to mature the buds,

and the damaged leaves are blocking that light from getting to healthy leaf material,
as well as draining energy from the plant.

about heat and your watering cycle:

30 c is not too bad,
it is when the temperature goes above 30 c  that you really have to worry.

This temperature is not too critical especially when flowering as some strains need  higher temperatures to fully mature.

Watering  at these temps:

Even with the higher temperature,
always watch your soil; if it is drying out quicker, than water more often;

If the soil is still wet from your last watering, then  do not water.

At higher temperatures, it becomes even more important to let the soil dry out a bit, as it is these temperatures, if the roots are too wet,  that produce the ideal conditions for serious root diseases to take hold.

If your plants are taking up more water and your pots are drying out quicker , then give the plants more water than nutrients, when you water them.

Plants subjected to higher temperatures take up more water and less nutrients.

Seaweed is high in potassium and phosphorus, and many other goodies that plants love, and this helps them cope with stress.

Also if you give your plants a nutrient that contains silicon, this  helps the plant cope with all forms of stress including heat stress.

Super thrive is full of b group vitamins that also help the plant to  handle stress.

Your plants are looking great; well done, my friend.
I wish you a bountiful harvest,
happy growing,
john