Leaning in ring sling

[lalath]

I'm just getting used to using a ring sling with 10-week-old DD, but she keeps sort of leaning to one side (away from the rings).

Her bum is in the right place, with her legs doing a good froggy/m-shape position, but her torso leans to my left. If I tighten the sling along the top rail then it seems like it's too tight across her neck. (I've seen videos saying that when this happens then it needs tightening.)

She seems happy enough - am I doing something wrong? How do I keep her more 'straight' and centred?

Any advice much appreciated!