39.5 Grams! Wow that is a little BP
If have only been trying F/T I personally would try again as soon as I could with Live. You need to get that little snake eating. I personally would try a Live Fuzzy and do it at night when the lights go off they get a little more secure when they don't feel they can be seen. The movement, Heat, and smell of a live fuzzy will give more feeding response triggers to your baby...
Can you post some pics of this little baby and your setup?