I can't see the second one, looks like photo bucket's playing up.
On the first one I'd have to agree with comments above, the thorax is too heavy. If orange is a good colour then definitely give an orange thorax a try. How about tying in a few, say 8, strands of orange marabou, twist them round the tying thread and make a slimmer, yet fluffy and mobile thorax out of that? Just a thought. Twisting them round the thread might make them a bit more durable against fishy teeth.
Either that or you might want to get some orange ostrich herl.