3rd 4th week from 12/12 into flowering leaves always fall to me?

pictures 2 post down are kinda better.

this almost always seams to happen to me some how i think rootbound but i see other plants better in smaller pots.. my bottom leaves or the fan leaves on up start falling off,what might the problem be please n thank you?!!? All i have is FF Grow Big and FF Big Bloom, any info how much of what i should use for a cure less its rootboud or ntrients burn..?? thanks

upp a lifes in need of an adult advisory of a cure.1!!

Hard to tell from pictures how much nutes are you using and at what strength, how often do you water/feed?

last time i recall i used about cap n half 2 of grow big 1 cap big bloom im waiting for them to dry out the soil for the next feed not tracking to good of the nutrients but the dirt was some black dirt our tomatoes usually always do good in its kinda compressed i think but i tried that thinkin it would help from getting rootboud cause thats what i almost always think the problem is but water every 3 to 5 days,, nutes prob every week and a half mayby longer (makes me think i should give nutes little more i dunno sry for so much hizighh thank youu!?

I use only Big Bloom for flowering and I do a teaspoon every other day. My opinion is that the Grow big is burning your leaves thats your entire problem. O and by the way I would flush if I were you. Happy Smokin Bro.