Ok. Many dont agree. But I think tiger bloom. Is junk. Will effectivly destroy soil health over time.
Maybe try big bloom by fox farm. Is a organic product tha will not burn or build up any salts. It also has micro nutrients.
Also. Are you city or well water? Have you been phing your nutrient solutions? Also tds meter to check ppm would be great to.
I don't usually harvest at differ times. But I set up my flowering rooms to have nice even canopy.
I think you will want to flush. 3x pot volume in fresh water. When using salt based fertilizers you will need to do this once a month or less. Keeps the build up down and ph correct.
First step would be to check your runoff ph and ppm. Make sure you put in 7.0 water to check runoff. You want 5.8-6.3 for flowering. I'd put money that your at low 5 or less. Locking out uptake of key nutrients