I don't know what temperature you'd want to get them up to (I'm no expert and I've actually often wondered what temperature is best suited myself(and don't use a microwave, just put them in hot water, maybe in a plastic bag so they don't get wet), but if you haven't tried it already with the F/Ts, heat 'em up. You could also try scenting - rub some fish on it... Or even different colored prey, that can work sometimes. If I'm just repeating stuff that you've already heard, I apologize. Only offering suggestions. You just sound like an overly-protective and anxious mother. LoL. That's not a bad thing. Just don't freak out and start cramming syringes in their little noggins yet.