I'd like to see you get your back flatter than that. Learning to use a belt on the deads is difficult and can take some time. That does not look like a true powerlifting belt, but you may want to consider a velcro belt for your pulls. It will interfere less. You can learn to use a 4" powerlifting belt, but it will fight you. On the plus side, despite your claims, you have no gut. A pronounced belly can also interfere with the setup.
Here are my recommendations:
- Spend less time in prayerful reflection while holding on to the bar. Just get the thing done. Put the bar down, squeeze up really hard, and pull. No more hanging out for 10 to 15 seconds hoping that things will feel lighter.
- Get a slightly wider grip.
- Internally rotate your humerus. This will point your elbows more forward and move your medial epicondyle out of the way a little. This will allow you to more effectively do the next step.
- Drive your knees out a little more.
- All of that should help you squeeze up.
- Squeeze up much harder. Get uncomfortable.