Personally, if you're going to struggle with the $4000 spend for the CSP I would REALLY consider if jumping into another $4000 Chase minimum spend is the best next step. I've been doing this a long time (and have gotten pretty good at it) and I don't monkey around too much with manufactured spending and would really have a hard time hitting an $8000 spend in 6 months PLUS the $450 annual fee for something like the Chase Reserve. I'm all for getting serious about points, but it's extremely easy to lose sight of the bigger financial picture.
I would meet the minimum spend on the CSP and see how it feels. Was it easy? Did you feel like you were spending more than you should be just to get bonus points? Did you realize there were big expenses that you could take care of that helped? Then dust off your Freedom, learn how to utilize your Ink and see how that goes. Then, if you feel you need to, add something else to the mix. My biggest piece of advice for this hobby is to let your spending dictate your cards, don't let your cards dictate your spending. People can get into A LOT of trouble waking up and realizing they need to spend 15 grand in 5 weeks.
That being said - I just finished the spend on the AmEx Delta Plat and I'm itching to get my hands on the CSR. I'm over 5/24 but a lot of people on r/churning who went pending with the leaked application went approved today. The vast majority of them were over 5/24. The Amex Plat looks like they put out a 75K public offer as well. It would be nice for the hotel status and lounge access, but I can't justify both annual fees and now that Flying Blue is a UR transfer partner, I'm back to Chase as my one true transferrable point love.