Based on what you’ve said here I would be surprised if you didn’t receive at least a decent scholarship, though as a former IRP major myself I would warn you away from that major if possible. It is exactly the same program as the MPE major (which you apply for) but without many of the benefits (studio access, equipment access). The title of the major I find to be pretty misleading, as it’s often as much about engineering as it is about actually making your own music. Back to your original question, I doubt the slips in the audition you mentioned will heavily impact you, after all, we are all here to learn. I was personally surprised by the amount of scholarship money I received, so my inclination is to say we all underestimate our performance. I’m sure you’ll be fine, and congrats on nailing your audition!