Hi, I think my situation is somewhat quite similar to yours. I'm also a BA applying to I/O psy PhD this fall, and my previous research experience was also studies relevant to college students' academic achievement. Penn State and Purdue are among my list of interest as well.
But psychology is only a minor for me (major in public administration), and my GPA was not at all competitive: about 3.5 cumulative. Still, I'm not so sure of my chance of being admitted as an International applicant from outside North America.
Maybe we should set up a new topic later for I/O applicants this fall~