There is some MCA data on this thread so you can see how you stack up to the MCA scores posted last year.
http://talk.collegeconfidential.com/cal-poly-san-luis-obispo/2060363-2018-final-status-p4.html
How do your stats compare to the Freshman profile averages from last year 2018:
CP GPA: 4.12 ACT: 30 SAT: 1410
Based on target and projections, Econ is a tougher admit %wise but Business Admin has 5x more applicants.
Regarding SDSU, I think it is a solid Match school for you but a 90% chance is considered a safety school, which it is not.
Also SDSU and SLO only accept up to the November SAT sitting so you are you retaking it in November?