I did it! I found a comfy position! I think, Anna, you had suggested somewhere once tying the straps over the belly instead of under, and I didn't listen... but I did it today when I was at a loss, and it worked! So thanks for the advice that I belatedly took!
I took my DD and my nephew on a good hour long walk when my DD started asking to nurse (and nap) right when my nephew woke up from the shortest nap ever. Nephew was in the stroller, and DD was like this in the mei tai!
From the front:
Another side shot: