I'm bringing about 20 pairs of socks plus toiletries, a fan, first aid stuff, a notebook, plus other miscellaneous things and my bag only comes out to 14lbs.
Give it another week and send again. Also bring a hard copy to rday in case they lose yours. That way you prevent getting put into wrong classes based on grades.
Make sure you do your pull ups with quality form and at a cadence. While there the cadre will tell you when to go up and down and trust me, they aren't generous. Be used to running in cool morning weather because you'll be taking the CFA at 0700 on an empty stomach.
Strive to reach the 1400 range to truly make yourself competitive. Also SAT scores a just a small part of what makes a competitive applicant. Luckily you have time to improve your file. PM me if you have questions. Good luck.