Just my thoughts here, I wouldn’t be too concerned with the arms, though I’m personally in favor of more midline up-stroke. As I mentioned to you on another website, I think it has helped our athlete though several other things were implemented simultaneously.
Lane 6 in an eight-lane equal quadrant track is not a bad draw, IMO. Though taking full advantage of it is important. If I recall Richards-Ross had a similar lane draw for her American Record as well.
I hope you are able to get in more races and/or simulated training bouts as necessary going forward.