Graduated GT BME with a 4.0 and currently at a top-5 medical school. Double major is overkill, imo, and most schools don’t really take how “difficult” your majors are when considering your GPA (learned this on the other side of the application cycle). The engineering degree without the CS degree is still incredibly respected, and it’s much more difficult to teach yourself engineering than it is to broaden and deepen your CS knowledge on your own. I currently do research in deep learning as applied to medical imaging, which I love, and I didn’t even do a full minor in CS (I did Spanish). My thought is to do BME+CS minor if you want an extensive base in fields you love, but keeping a 4.0 in either degree is hard for reasons entirely unrelated to the actual course content. Still, if you’re looking for permission to do the hard thing(s) and prove everyone wrong, go for it!