Hi there , to what I can make up of your problem without a pic is this.

You are burning the plants with fertilizers , I never go over 1200 ppm.

Maybe 1300 , also try to have the PH closer to 6.0 .
This way my plants are healthy.

I recommend flushing real good and not going crazy on the nutes.

Less is Better beleive me . otherwise you will smoke harsh bud.

Here is my plants at 4 weeks . Check out the leaves no burned tips and lucious greeeeen :thumbsup:

So Flush with plain PH 6.0 Water and try to keep lower PPM and a little higher PH.

Works 4 me

:S5: