I agree as well. Humidity and lighting along with any root disturbance are the main causes for change in pitcher size. I never had pitcher size go down with feeding. It only progressively gets bigger. Change in pitcher size also happens due to temperature stress. I have a macrophylla and villosa that was making progressively bigger pitchers and then suddenly...made pitchers 1/4 their size in peak summer/early autumn. I am sure it will get better as winter gets going.