Test optional to Grainger or not????

Hi, my application is solid/legit beside my test scores. Grades, EC, essays are all very good. I have a 1350(760M and 590R). Grainger engineering has middle 50% around 1480-1550. Should I go test optional? 82% of applications have a test score to Grainger. My family says I should submit. I said I shouldn’t. How should I go about this? I’m in state. I’m really stressed about this and doubting myself. I submitted it to Purdue, IiT, UMich, with the super score

(Superscore 1430 - 670R 760M)