What seems to be wrong with my automated Lettuce farm?

Since the harvester can only really do vanilla crops, I used autonomous activators on each of my lettuce plants with an itemduct connecting the output slots to a JABBA barrel. You can choose whether the autonomous activators right or left click, so by having them right click you don't have to worry about replanting the lettuce seeds. Yeah, it's expensive and takes up too much space, but it works pretty well seeing as harvesters aren't compatible.