12 grams is nothing I have 250 grams snakes having bowel movement bigger than that.
If you have not done so already downsize the tub to the very minimum, during the winter I keep male 800 grams and less in 15 quarts tub to ensure that they will eat throughout breeding season.
If you have done it already simply be patient.
I have had animals that were on F/T and started refusing after a while and once switch to live resume feeding however I do not recommend this unless you know how to feed live and are willing to take the risk of your BP not switching back.
I haven't heard about switching to a smaller tub in the winter months. I'll remember that.
I have already tried feeding him a small live mouse..he didn't want nothing to do with it.