Tentacle length looks fine to me; definitely not the stubby "starved" look. I have one that has longer tentacles and one that has shorter, and their tentacles don't always look the same throughout the day. As for flow, that does look like a lot if it's constant. Mine are both pretty close to a Vortech in Reef Crest mode and seem to like it, but it provides them with periods of calm as well as very strong current that blows them around. The one with longer tentacles moved slightly to the side to get less flow, but the one with shorter tentacles stays where it gets fully blasted. As someone mentioned in the other thread, I'd also recommend moving the powerheads a little to get some more dispersal of flow. It seems to be doing fine with that much flow, but backing it off a bit won't hurt it and will make it easier for the poor clowns to stay in it.
The only comment I would make is that it looks a little pale to me, but that could easily be the lighting or camera. Mine are also under 6 ATI bulbs; what combination are you using?