Purple Lemonade

At the beginning of the 6th bloom week my plants grow quite slowly maybe because the temperature now in my place is quite high, the climate is hot and humid. I feel that the buds are quite small compared to normal and the plant has a few yellow leaves that do not know due to waterlogging or lack of nutrition. Who can tell me the secret to making the bud size bigger when growing organic? I'm using dr.earth organic fertilizer and ppm of runoff water in the last watering is 870ppm