Someone with a 4.0 and a 2400 on the SAT has less than 5% chance of getting into Harvard. You need to identify schools you have a real chance of getting into. First generation is not that unique. CDS would show that most east coast schools accept more people from the SAT’s not the ACT. I would take both.
Here’s CDS links to the ivys.
http://www.princeton.edu/provost/institutional-research/common-data-set/