Wow, big time improvement not that the first video was god awful.
I think that hip crease irritation was from the way you were squatting. You weren't opening up your hips enough and when that happens, you're going to end up running into your hip flexors and mashing through them.
But it looks like you fixed that.
It also seems like you have the right idea for fixing the hip flexor issues developed from your old form.
All of this in a relatively short amount of time.
FWIW, props to ya.