hey friend! i just moved my adult male corn into a 40gal; more space than he's ever had in his life!
IMO corns are pretty stress-free animals. granted i've never dealt with a baby corn (mine was surrendered to me as an adult) but i think that's a fair assessment.
burrowing is totally normal behavior. first thing my corn did in his new viv was burrow and recreate his "tunnel system" from his old viv.
smaller, identical hides will help. the one you have in the photo looks big; i have the same brand of hide myself.
EDIT: photo
Ahh yea thanks! The hide in the photo is the 1 she had in her previous viv! She did explore for a bit when I first put her in ) I was just reading ur post about ur corn! I'm loving his set-up!