Great comment! You are doing exactly what you should be doing. Your numbers on your blog show it too. I recommend that you vote for every post that you comment on. (find an app that gives you a percentage option)

Some authors, myself included, look for those who have voted and commented to show how much they like a post. Those who voted for me are first in line for vote-backs. The others get votes only if I have any voting power left for the day.