flushing soil cause of over use of nutes??

im 10 days into flowering. the leaves have curled a little and the new shoots are lime greem/yellow and im concerned the soil is fucked up and ive over done it with biobizz nutes.....either that or overwatered as someone else said and the plant isnt getting the oxygen it needs. I water daily as its around 30deg and the water evaporates pretty quick....I stick my finger in the next day and the soil is dry.....so I water again (around 750ml in an 18l pot). Anyhow, I decided to give the pot a good flush just in case and start again......is this a bad thing? I was just worried the PH was out and there was a bad build up.
how do you know when the pot is too dry and in need of watering and when it isnt? I know this sounds a stupid Q, but ive done all the things ive read such as pick the pot up and feel the weight and put my finger in the soil.....it always seems dry enough the next day......or is watering daily a no no??

sorry for so many Q`s....

If the pot feels light, water.
Watering daily is fine if the plant goes through water that fast.
Let the top couple inches get pretty dry.
If you are worried about not enough O2 to the roots, drill big holes in the sides of the pot.
And control your temps!

Thanks for that!
my temps are at 30-31deg during the light on period. I cannot do much better than that.....its summer here....