Newbie mistake. Fertilize when not needed!

Some soil used is perfect, trying to make it better ruins the soil, 4ever!

If u started out with good soil, leave it alone, only use fert. on MOTHER plants as a rule of thumb for me.

When u water, the fert. becomes real active, making ur plants droop. (From what u said) Plus the temperature of ur water is important!!!

Peace
MM