I wish you were a little closer, I would come take a look.
The behavior you described would be odd for a gigantea as well.
Your anemone is certainly unusual, but after the last round of pics and descriptions of its fish catching ability, I am pretty sure you have an unsual haddoni.
Anemones have the ability to change based on their conditions, especially tentacle shape. In nature they tend to live in their specific niche and therefore all members of a species look very similar.
When you put them in an aquarium situation, all bets are off. In most cases anemone aren't able to adjust to conditions that are too far from their norm and they die. I would argue that your anemone, having been in captivity for quite a while, has been able to adjust its stuctures a bit to better suit its captive life.