@Jpgranier I don’t do chance threads but do want to give you a little bit of advice. For Georgia Tech be sure to reach out to the Hispanic Recruitment Team, the admissions person in charge of Hispanic recruitment (believe it is still Kevin Gonzalez) and attend a visit event at GT hosted by HRT (I think it is called Destination Tech). You must contact HRT and Mr. Gonzalez to get an invite to it. You will increase you chances at GT by visiting and really getting to know the school. In your supplement you need to be specifics as to why GT (programs, classes etc).
For GT you must apply EA- the admission rate is much higher and with GT getting harder to get into every year you want to have the odds in your favor. GT’s EA is due on Oct 15 and that includes sending of test scores and transcripts (which means you have to order them this week since it takes about 3 weeks to get their (SAT or ACT scores). I also suggest you apply EA to SMU. I believe the Hispanic Admissions Recruiter is Rick Diaz.
One final recommendation-reconsider your recommenders. For engineering you must have a junior year science or math teacher. Unless the guy at the scholarship organization gave you, that recommendation is really worthless for college admissions. Colleges want to hear from people who have taught you.
As far as your question about being flexible in majors for engineering, you simply have to do the research yourself. I do not that Cal Poly is inflexible, GT and SMU are flexible. TAMU changed that recently so check with them. Know that going in as an undeclared engineering is not recommended because some of my students have not been able to switch into their desired major.