I'm not expert, but I don't see anything glaringly wrong with your form.
I think so much of how much we do has alot to do with genetics. I'm in the exact opposite boat as you. I'm at a sub 300lb squat but just did 235x5x3 on bench and it hasn't slowed down. Just the name of the game unfortunately. Your amounts do sound pretty extreme. I noticed you said you are at 157lb. Where did that 7 come from. Are you already microloading the bench? I'm not positive, but at this low of a weight compared to your weight, I don't think you should already be microloading. I am of course assuming you weight a good amount (to be able to squat 350).