Sounds like you've figured out the the lower leg alignment is a result of things that happen earlier in your delivery and you're putting your focus on the earlier parts of your delivery. So I think you're on the right track.
What direction do you stride? If you stride to the 1B side, that - coupled with starting on the left side of the rubber - can really set you up for a big posture shift to the 3B side.
Video would really help. Unfortunately, I've never post any so I'm not much help there.