Here is what I would do for optimal result if you have not done so already
6 quarts tub, aspen bedding to allow the animal to burrow, 6 inches plastic flower pot saucer, 76/88 for temps, wait a week, NO HANDLING, offer a LIVE hopper mouse for starter, open the tub, drop the mouse, close the tub and move away, remove the prey if not eaten after 15 min