3 water dishes and just 10% humidity?

even if the top is open, thats a bit hard for me to believe. measuring humidity is notoriously difficult, temperature is easy, so while cheap thermometers often do their job just fine, even higher priced hygrometers can be off by large margins. my room never gets below 30% except when its really cold outside and im heating. and thats just me, and a window that is partially open all the time, and some plants. it depends on where you live, the local climate, plants in the room also make a difference, but i am inclined to blame the 10% on a broken hygrometer.

that being said, the humidity is probarbly too low, and restricting air flow by adding some cardboard wrapped in aluminium foil to the top is a good idea. if humidity then doesnt go up immediately but stays at 10%, the hygrometer is broken for sure. misting down with a spray bottle also helps, again, if the hygrometer doesnt respond, its broken.

bump up the size of the food items. two guidelines are: the girth of the food item should match the widest girth of the BP, that means the food item will be larger than the head of the BP. the second one, for young BPs like the one you have, requires something like a kitchen scale that measures in grams. you can get them cheaply, a kitchen scale with a bowl that has a resolution of 1 gram or 2 grams and that goes up to 2000 or 5000 grams is just fine. then, the rule for young BPs is 10-15% of the body weight of the BP every 5-7 days. its not set in stone, but it should give you a general idea. mouse pinkies are too tiny. with your BP at 109 grams, a mouse somewhere between 10 and 20 grams will be fine. thats a young adult mouse. BPs dislocate their lower jaw and stretch their neck for every appropriately sized meal, and the food item is always much bigger than the head of the BP, its normal.