They recommend this for organic, which I think means slow-release: https://www.amazon.com/Jonathan-Green-7566565-Organic-10-0-1/dp/B07JYRYJ6J?th=1 -- is this a solid option? Their non-organic suggestion is this: https://www.amazon.com/Flagship-Fertilizer-Bio-NiteTM-Potassium-Micronutrients/dp/B08YGTH3P2?th=1

Not sure how to evaluate which one to buy or something else. Would prefer something available on Amazon at this point because I'd like to get it down ASAP.

Will follow your suggestion on spacing out the treatments. I have access to Bartell's which I know locals like for its custom seed, so I can always spring for something there if you think it's better than BBU. I thought higher quality seed might be wasted on me at this point in my journey though. One question, for cool season grass, I thought I was supposed to seed more towards fall, like after labor day. Is late august the timeline I should be aiming for to make the bets use of fall growth?

Thanks again!