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Congrats, now wait six months!
You're exactly right that you should wait at least 91 days between AORs. Applying for new credit 3 months from your last inquiry should be fine, since you will have a FICO score by then. I would wait until your FICO is above 700 to try the SPG and Freedom again, since your file is so thin. The CSP is definitely a premium card so I would wait at least a year.