Hi,
I'd also like to know how much he weighs and if he has managed to grow much since you have had him? A picture of him might be handy to judge his size better so we can be more aware of what might be the best alternative prey to try.
I've found the key to a good feeding response with mine is for them to know food is going to be offered - this is what the dry defrosting near the cage does - the hairdrier just slams the message into overdrive as it spreads the warm prey scent around.
I know you may not want it to be a long term solution but I would definitely try mice or african soft furred rats of the same size.
Your temps don't sound too bad but it depends on how and where you are measuring them - is it with a probe inside the hides orsomewhere else? If the temp inside the hide ( where the snake hangs out ) is lower than the 79f you think it might be worth bumping those temps up until the hide is the right temp.
But good call on stopping the handling when the problem started.
del