Orcafood, keep up the feeding regimen, smaller sizes.. about the size of a pea are best in this case, silversides are fine, but use only about a quarter of one at a time, they will digest more and spit less back. in the wild they eat small food particles very frequently, not large pieces occasionally. Sometimes anemones being fed large food pieces will starve even though they are taking in food, it gets spit out before adequate digestion. This can take weeks or months and be very slow. Small stubby tentacles are a sign of starvation, not light deprivation. The variety of foods is best.. including formula 1. cyclopeeze, shrimp, squid, mysis, scallop etc. It can take a while, but it sounds like you are on the right track, be patient.
Jamie, do you run carbon?. Multiple anemones will chemically (Allepathy) compete in a closed aquarium. This can result in poor health or death of one or more anemones. carbon helps, but most often it's best not to have more than one non-clone in a tank. (Clones don't usually fight one another)
Hope this helps
Randy