Increasing PPM's doesn't mean increase bud size, lots of variables lights your using container size, what your actually putting in to increase the ppm could be incorrect and you actually decrease size. I grow in soil and I started keeping track of the PPM's then I just got used to what my plants can handle with the setup I have every strain. A little different but when you grow same strain 2 3 4 times you start to learn your limits and that's the fun part. You are doing awesome for a new grower keep it up, remember can always add more.