Cole - Yep, it's a lot to digest/orchestrate. But then again, it's not.
Your knee slide forward is pretty minimal, but it shows us that you aren't reaching back enough with your hips. The knee slide backwards shows that they are not in the correct position to serve as that lever required to get the bar moving upward. Your hips are driving upward, but the bar doesn't move upward until your knees are in the correct position, hence the good morning.
The simultaneous chest down/hips back move happens when you focus on reaching your ass to the wall behind. If your chest is popping up a tad as your hips reach proper depth, you probably need a slightly wider stance.
So, from the top...
1. Unrack
2. Balance
3. Visualize your Groove and keep the bar in it through the whole lift
4. Break both knees and hips at the same time
5. Lock that knee location while continuing to hinge the hips and knees
6. Reach back with your hips and get that belt between your thighs/nipples towards the floor
7. Drive the hips out of the hole while maintaining back angle
8. Once the knees are close to lockout, open the back angle to lock out the lift.
It seems like a lot, but it really isn't once you get the feel. Do each and every warmup rep that way and there's no need to reset weight or stay at 315. As an example, for my standard Squat warmup that includes 45x10x3 when walking in cold, I have 40-41 total reps to focus on the correct form before getting to the work sets. It's a bit more difficult with the empty bar, but as weight is added to the bar during the warmup reps, everything gets into place.
Part of you keeping your chest upright during the descent is that you're afraid of getting stapled and that's how it manifests itself. No need to worry about that, as long as you work on your technique consistently and stick to your program. Sure, it will happen eventually, but don't let that deter you from getting that back angle correct at the beginning of your rep.
Keep at it!