I think you're on the right track, but I believe the opposite is true. It would make more sense that the anemone would have longer arms when searching for food.
I have experimented with this twice in my tank. I have a RBTA that was bubbled when I got it. I didn't feed it and within a week it lost its bubbles. I started feeding it again, EVERY DAY (consistency is key), and about 3 weeks later it was fully bubbled. I missed 3 days of feeding and it was back to no bubbles, which I fixed by consistent feedings. Now I'm getting it to split by denying it target feedings (a process that's worked before, I think because it slightly stresses the animal). Since I'm not feeding it right now, the arms are long.
Get some fresh shrimp and cut a little piece off every day, about the size of a fingertip, and mash it up until its kind of a paste. Just squeeze it a few times between your fingers. You're basically "chewing" the food for the anemone. Remember consistency is key. You gotta feed it every day, and at the same time of day.
These are techniques that have worked for me, and I can control my anemone's behavior very effectively with them.