Favors one side?

KT05

My 3m old really favors the left side. I offer righty first but she'll pull off crying within about a minute. I know she's getting milk because when she lets go milk comes out plus I can pump a good amount. I've tried different holds, all the same result. Any ideas? It's not really a problem per se, but my other side is taking a beating and I'd like to even things out if I can.