Yo Raymond, can you get a hold of some squat shoes; they make a huge difference. The stability of a pair of squat shoes holds your feet in place in the shoe; Due to the metatarsal strap binding your feet to the soles of the shoe.
The squat the bar seems to roll a bit and, your upper back not tight enough. Just keep your chest up, pin your elbows together and reach back more in the hips. Also, brace harder.
The Squat - Upper Back Position with Jayson Ball - YouTube
The same thing on the press elbows up and chest up hard! Try to learn the hip bounce at the start.
Learn to Use Your Hips in the Press with Grant Broggi - YouTube (My fatass is in this video.)
Keep using a belt; it has good proprioceptive feedback giving you a sense of how hard you're bracing.
I'm not an SSC. I'm just a guy who lifts a little.
Probably post on the form check forum to get better feedback to fix these minor deviations.
Keep up the good work!
Brent