trying to narrow down my problem! to much or too little?

The only nutrient i had for a while was miracle grow, i used very very little. I think i was underfeeding., i was so scared to over feed,
I just started feeding the terra flora, 2-2-4 i am just over three weeks into flowering. Any help would be great. These signs started before my switch. Besides that the plants appear to be healthy and are growing nice